Java Code Examples for jdk.nashorn.internal.runtime.arrays.ArrayLikeIterator

@Override
public Iterator<String> propertyIterator() {
    // Try __getIds__ first, if not found then try __getKeys__
    // In jdk6, we had added "__getIds__" so this is just for compatibility.
    Object func = adaptee.get(__getIds__);
    if (!(func instanceof ScriptFunction)) {
        func = adaptee.get(__getKeys__);
    }

    Object obj;
    if (func instanceof ScriptFunction) {
        obj = ScriptRuntime.apply((ScriptFunction)func, adaptee);
    } else {
        obj = new NativeArray(0);
    }

    final List<String> array = new ArrayList<>();
    for (final Iterator<Object> iter = ArrayLikeIterator.arrayLikeIterator(obj); iter.hasNext(); ) {
        array.add((String)iter.next());
    }

    return array.iterator();
}
 

/**
 * ECMA 15.4.4.19 Array.prototype.map ( callbackfn [ , thisArg ] )
 *
 * @param self        self reference
 * @param callbackfn  callback function per element
 * @param thisArg     this argument
 * @return array with elements transformed by map function
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, arity = 1)
public static NativeArray map(final Object self, final Object callbackfn, final Object thisArg) {
    return new IteratorAction<NativeArray>(Global.toObject(self), callbackfn, thisArg, null) {
        private final MethodHandle mapInvoker = getMAP_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final double i) throws Throwable {
            final Object r = mapInvoker.invokeExact(callbackfn, thisArg, val, i, self);
            result.defineOwnProperty(ArrayIndex.getArrayIndex(index), r);
            return true;
        }

        @Override
        public void applyLoopBegin(final ArrayLikeIterator<Object> iter0) {
            // map return array should be of same length as source array
            // even if callback reduces source array length
            result = new NativeArray(iter0.getLength());
        }
    }.apply();
}
 

@Override
public Iterator<String> propertyIterator() {
    // Try __getIds__ first, if not found then try __getKeys__
    // In jdk6, we had added "__getIds__" so this is just for compatibility.
    Object func = adaptee.get(__getIds__);
    if (!(func instanceof ScriptFunction)) {
        func = adaptee.get(__getKeys__);
    }

    Object obj;
    if (func instanceof ScriptFunction) {
        obj = ScriptRuntime.apply((ScriptFunction)func, adaptee);
    } else {
        obj = new NativeArray(0);
    }

    final List<String> array = new ArrayList<>();
    for (final Iterator<Object> iter = ArrayLikeIterator.arrayLikeIterator(obj); iter.hasNext(); ) {
        array.add((String)iter.next());
    }

    return array.iterator();
}
 

/**
 * ECMA 15.4.4.19 Array.prototype.map ( callbackfn [ , thisArg ] )
 *
 * @param self        self reference
 * @param callbackfn  callback function per element
 * @param thisArg     this argument
 * @return array with elements transformed by map function
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, arity = 1)
public static NativeArray map(final Object self, final Object callbackfn, final Object thisArg) {
    return new IteratorAction<NativeArray>(Global.toObject(self), callbackfn, thisArg, null) {
        private final MethodHandle mapInvoker = getMAP_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final long i) throws Throwable {
            final Object r = mapInvoker.invokeExact(callbackfn, thisArg, val, i, self);
            result.defineOwnProperty(ArrayIndex.getArrayIndex(index), r);
            return true;
        }

        @Override
        public void applyLoopBegin(final ArrayLikeIterator<Object> iter0) {
            // map return array should be of same length as source array
            // even if callback reduces source array length
            result = new NativeArray(iter0.getLength());
        }
    }.apply();
}
 

@Override
public Iterator<String> propertyIterator() {
    // Try __getIds__ first, if not found then try __getKeys__
    // In jdk6, we had added "__getIds__" so this is just for compatibility.
    Object func = adaptee.get(__getIds__);
    if (!(func instanceof ScriptFunction)) {
        func = adaptee.get(__getKeys__);
    }

    Object obj;
    if (func instanceof ScriptFunction) {
        obj = ScriptRuntime.apply((ScriptFunction)func, adaptee);
    } else {
        obj = new NativeArray(0);
    }

    final List<String> array = new ArrayList<>();
    for (final Iterator<Object> iter = ArrayLikeIterator.arrayLikeIterator(obj); iter.hasNext(); ) {
        array.add((String)iter.next());
    }

    return array.iterator();
}
 

/**
 * ECMA 15.4.4.19 Array.prototype.map ( callbackfn [ , thisArg ] )
 *
 * @param self        self reference
 * @param callbackfn  callback function per element
 * @param thisArg     this argument
 * @return array with elements transformed by map function
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, arity = 1)
public static NativeArray map(final Object self, final Object callbackfn, final Object thisArg) {
    return new IteratorAction<NativeArray>(Global.toObject(self), callbackfn, thisArg, null) {
        private final MethodHandle mapInvoker = getMAP_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final double i) throws Throwable {
            final Object r = mapInvoker.invokeExact(callbackfn, thisArg, val, i, self);
            result.defineOwnProperty(ArrayIndex.getArrayIndex(index), r);
            return true;
        }

        @Override
        public void applyLoopBegin(final ArrayLikeIterator<Object> iter0) {
            // map return array should be of same length as source array
            // even if callback reduces source array length
            result = new NativeArray(iter0.getLength());
        }
    }.apply();
}
 

@Override
public Iterator<String> propertyIterator() {
    // Try __getIds__ first, if not found then try __getKeys__
    // In jdk6, we had added "__getIds__" so this is just for compatibility.
    Object func = adaptee.get(__getIds__);
    if (!(func instanceof ScriptFunction)) {
        func = adaptee.get(__getKeys__);
    }

    Object obj;
    if (func instanceof ScriptFunction) {
        obj = ScriptRuntime.apply((ScriptFunction)func, adaptee);
    } else {
        obj = new NativeArray(0);
    }

    final List<String> array = new ArrayList<>();
    for (final Iterator<Object> iter = ArrayLikeIterator.arrayLikeIterator(obj); iter.hasNext(); ) {
        array.add((String)iter.next());
    }

    return array.iterator();
}
 

/**
 * ECMA 15.4.4.19 Array.prototype.map ( callbackfn [ , thisArg ] )
 *
 * @param self        self reference
 * @param callbackfn  callback function per element
 * @param thisArg     this argument
 * @return array with elements transformed by map function
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, arity = 1)
public static NativeArray map(final Object self, final Object callbackfn, final Object thisArg) {
    return new IteratorAction<NativeArray>(Global.toObject(self), callbackfn, thisArg, null) {
        private final MethodHandle mapInvoker = getMAP_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final double i) throws Throwable {
            final Object r = mapInvoker.invokeExact(callbackfn, thisArg, val, i, self);
            result.defineOwnProperty(ArrayIndex.getArrayIndex(index), r);
            return true;
        }

        @Override
        public void applyLoopBegin(final ArrayLikeIterator<Object> iter0) {
            // map return array should be of same length as source array
            // even if callback reduces source array length
            result = new NativeArray(iter0.getLength());
        }
    }.apply();
}
 

@Override
public Iterator<String> propertyIterator() {
    // Try __getIds__ first, if not found then try __getKeys__
    // In jdk6, we had added "__getIds__" so this is just for compatibility.
    Object func = adaptee.get(__getIds__);
    if (!(func instanceof ScriptFunction)) {
        func = adaptee.get(__getKeys__);
    }

    Object obj;
    if (func instanceof ScriptFunction) {
        obj = ScriptRuntime.apply((ScriptFunction)func, this);
    } else {
        obj = new NativeArray(0);
    }

    final List<String> array = new ArrayList<>();
    for (final Iterator<Object> iter = ArrayLikeIterator.arrayLikeIterator(obj); iter.hasNext(); ) {
        array.add((String)iter.next());
    }

    return array.iterator();
}
 

/**
 * ECMA 15.4.4.19 Array.prototype.map ( callbackfn [ , thisArg ] )
 *
 * @param self        self reference
 * @param callbackfn  callback function per element
 * @param thisArg     this argument
 * @return array with elements transformed by map function
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, arity = 1)
public static NativeArray map(final Object self, final Object callbackfn, final Object thisArg) {
    return new IteratorAction<NativeArray>(Global.toObject(self), callbackfn, thisArg, null) {
        private final MethodHandle mapInvoker = getMAP_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final double i) throws Throwable {
            final Object r = mapInvoker.invokeExact(callbackfn, thisArg, val, i, self);
            result.defineOwnProperty(ArrayIndex.getArrayIndex(index), r);
            return true;
        }

        @Override
        public void applyLoopBegin(final ArrayLikeIterator<Object> iter0) {
            // map return array should be of same length as source array
            // even if callback reduces source array length
            result = new NativeArray(iter0.getLength());
        }
    }.apply();
}
 

@Override
public Iterator<String> propertyIterator() {
    // Try __getIds__ first, if not found then try __getKeys__
    // In jdk6, we had added "__getIds__" so this is just for compatibility.
    Object func = adaptee.get(__getIds__);
    if (!(func instanceof ScriptFunction)) {
        func = adaptee.get(__getKeys__);
    }

    Object obj;
    if (func instanceof ScriptFunction) {
        obj = ScriptRuntime.apply((ScriptFunction)func, adaptee);
    } else {
        obj = new NativeArray(0);
    }

    final List<String> array = new ArrayList<>();
    for (final Iterator<Object> iter = ArrayLikeIterator.arrayLikeIterator(obj); iter.hasNext(); ) {
        array.add((String)iter.next());
    }

    return array.iterator();
}
 

/**
 * ECMA 15.4.4.19 Array.prototype.map ( callbackfn [ , thisArg ] )
 *
 * @param self        self reference
 * @param callbackfn  callback function per element
 * @param thisArg     this argument
 * @return array with elements transformed by map function
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, arity = 1)
public static NativeArray map(final Object self, final Object callbackfn, final Object thisArg) {
    return new IteratorAction<NativeArray>(Global.toObject(self), callbackfn, thisArg, null) {
        private final MethodHandle mapInvoker = getMAP_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final double i) throws Throwable {
            final Object r = mapInvoker.invokeExact(callbackfn, thisArg, val, i, self);
            result.defineOwnProperty(ArrayIndex.getArrayIndex(index), r);
            return true;
        }

        @Override
        public void applyLoopBegin(final ArrayLikeIterator<Object> iter0) {
            // map return array should be of same length as source array
            // even if callback reduces source array length
            result = new NativeArray(iter0.getLength());
        }
    }.apply();
}
 

@Override
public Iterator<String> propertyIterator() {
    // Try __getIds__ first, if not found then try __getKeys__
    // In jdk6, we had added "__getIds__" so this is just for compatibility.
    Object func = adaptee.get(__getIds__);
    if (!(func instanceof ScriptFunction)) {
        func = adaptee.get(__getKeys__);
    }

    Object obj;
    if (func instanceof ScriptFunction) {
        obj = ScriptRuntime.apply((ScriptFunction)func, adaptee);
    } else {
        obj = new NativeArray(0);
    }

    final List<String> array = new ArrayList<>();
    for (final Iterator<Object> iter = ArrayLikeIterator.arrayLikeIterator(obj); iter.hasNext(); ) {
        array.add((String)iter.next());
    }

    return array.iterator();
}
 

/**
 * ECMA 15.4.4.19 Array.prototype.map ( callbackfn [ , thisArg ] )
 *
 * @param self        self reference
 * @param callbackfn  callback function per element
 * @param thisArg     this argument
 * @return array with elements transformed by map function
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, arity = 1)
public static Object map(final Object self, final Object callbackfn, final Object thisArg) {
    return new IteratorAction<NativeArray>(Global.toObject(self), callbackfn, thisArg, null) {
        private final MethodHandle mapInvoker = getMAP_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final long i) throws Throwable {
            final Object r = mapInvoker.invokeExact(callbackfn, thisArg, val, i, self);
            result.defineOwnProperty(ArrayIndex.getArrayIndex(index), r);
            return true;
        }

        @Override
        public void applyLoopBegin(final ArrayLikeIterator<Object> iter0) {
            // map return array should be of same length as source array
            // even if callback reduces source array length
            result = new NativeArray(iter0.getLength());
        }
    }.apply();
}
 

@Override
public Iterator<String> propertyIterator() {
    // Try __getIds__ first, if not found then try __getKeys__
    // In jdk6, we had added "__getIds__" so this is just for compatibility.
    Object func = adaptee.get(__getIds__);
    if (!(func instanceof ScriptFunction)) {
        func = adaptee.get(__getKeys__);
    }

    Object obj;
    if (func instanceof ScriptFunction) {
        obj = ScriptRuntime.apply((ScriptFunction)func, adaptee);
    } else {
        obj = new NativeArray(0);
    }

    final List<String> array = new ArrayList<>();
    for (final Iterator<Object> iter = ArrayLikeIterator.arrayLikeIterator(obj); iter.hasNext(); ) {
        array.add((String)iter.next());
    }

    return array.iterator();
}
 

/**
 * ECMA 15.4.4.19 Array.prototype.map ( callbackfn [ , thisArg ] )
 *
 * @param self        self reference
 * @param callbackfn  callback function per element
 * @param thisArg     this argument
 * @return array with elements transformed by map function
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, arity = 1)
public static Object map(final Object self, final Object callbackfn, final Object thisArg) {
    return new IteratorAction<NativeArray>(Global.toObject(self), callbackfn, thisArg, null) {
        private final MethodHandle mapInvoker = getMAP_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final long i) throws Throwable {
            final Object r = mapInvoker.invokeExact(callbackfn, thisArg, val, i, self);
            result.defineOwnProperty(ArrayIndex.getArrayIndex(index), r);
            return true;
        }

        @Override
        public void applyLoopBegin(final ArrayLikeIterator<Object> iter0) {
            // map return array should be of same length as source array
            // even if callback reduces source array length
            result = new NativeArray(iter0.getLength());
        }
    }.apply();
}
 

@Override
public Iterator<String> propertyIterator() {
    // Try __getIds__ first, if not found then try __getKeys__
    // In jdk6, we had added "__getIds__" so this is just for compatibility.
    Object func = adaptee.get(__getIds__);
    if (!(func instanceof ScriptFunction)) {
        func = adaptee.get(__getKeys__);
    }

    Object obj;
    if (func instanceof ScriptFunction) {
        obj = ScriptRuntime.apply((ScriptFunction)func, adaptee);
    } else {
        obj = new NativeArray(0);
    }

    final List<String> array = new ArrayList<>();
    for (final Iterator<Object> iter = ArrayLikeIterator.arrayLikeIterator(obj); iter.hasNext(); ) {
        array.add((String)iter.next());
    }

    return array.iterator();
}
 

/**
 * ECMA 15.4.4.19 Array.prototype.map ( callbackfn [ , thisArg ] )
 *
 * @param self        self reference
 * @param callbackfn  callback function per element
 * @param thisArg     this argument
 * @return array with elements transformed by map function
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, arity = 1)
public static NativeArray map(final Object self, final Object callbackfn, final Object thisArg) {
    return new IteratorAction<NativeArray>(Global.toObject(self), callbackfn, thisArg, null) {
        private final MethodHandle mapInvoker = getMAP_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final double i) throws Throwable {
            final Object r = mapInvoker.invokeExact(callbackfn, thisArg, val, i, self);
            result.defineOwnProperty(ArrayIndex.getArrayIndex(index), r);
            return true;
        }

        @Override
        public void applyLoopBegin(final ArrayLikeIterator<Object> iter0) {
            // map return array should be of same length as source array
            // even if callback reduces source array length
            result = new NativeArray(iter0.getLength());
        }
    }.apply();
}
 

@Override
public Iterator<String> propertyIterator() {
    // Try __getIds__ first, if not found then try __getKeys__
    // In jdk6, we had added "__getIds__" so this is just for compatibility.
    Object func = adaptee.get(__getIds__);
    if (!(func instanceof ScriptFunction)) {
        func = adaptee.get(__getKeys__);
    }

    Object obj;
    if (func instanceof ScriptFunction) {
        obj = ScriptRuntime.apply((ScriptFunction)func, adaptee);
    } else {
        obj = new NativeArray(0);
    }

    final List<String> array = new ArrayList<>();
    for (final Iterator<Object> iter = ArrayLikeIterator.arrayLikeIterator(obj); iter.hasNext(); ) {
        array.add((String)iter.next());
    }

    return array.iterator();
}
 

/**
 * ECMA 15.4.4.19 Array.prototype.map ( callbackfn [ , thisArg ] )
 *
 * @param self        self reference
 * @param callbackfn  callback function per element
 * @param thisArg     this argument
 * @return array with elements transformed by map function
 */
@Function(attributes = Attribute.NOT_ENUMERABLE, arity = 1)
public static Object map(final Object self, final Object callbackfn, final Object thisArg) {
    return new IteratorAction<NativeArray>(Global.toObject(self), callbackfn, thisArg, null) {
        private final MethodHandle mapInvoker = getMAP_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final long i) throws Throwable {
            final Object r = mapInvoker.invokeExact(callbackfn, thisArg, val, i, self);
            result.defineOwnProperty(ArrayIndex.getArrayIndex(index), r);
            return true;
        }

        @Override
        public void applyLoopBegin(final ArrayLikeIterator<Object> iter0) {
            // map return array should be of same length as source array
            // even if callback reduces source array length
            result = new NativeArray(iter0.getLength());
        }
    }.apply();
}
 

private static Object reduceInner(final ArrayLikeIterator<Object> iter, final Object self, final Object... args) {
    final Object  callbackfn          = args.length > 0 ? args[0] : ScriptRuntime.UNDEFINED;
    final boolean initialValuePresent = args.length > 1;

    Object initialValue = initialValuePresent ? args[1] : ScriptRuntime.UNDEFINED;

    if (callbackfn == ScriptRuntime.UNDEFINED) {
        throw typeError("not.a.function", "undefined");
    }

    if (!initialValuePresent) {
        if (iter.hasNext()) {
            initialValue = iter.next();
        } else {
            throw typeError("array.reduce.invalid.init");
        }
    }

    //if initial value is ScriptRuntime.UNDEFINED - step forward once.
    return new IteratorAction<Object>(Global.toObject(self), callbackfn, ScriptRuntime.UNDEFINED, initialValue, iter) {
        private final MethodHandle reduceInvoker = getREDUCE_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final double i) throws Throwable {
            // TODO: why can't I declare the second arg as Undefined.class?
            result = reduceInvoker.invokeExact(callbackfn, ScriptRuntime.UNDEFINED, result, val, i, self);
            return true;
        }
    }.apply();
}
 

private static Object reduceInner(final ArrayLikeIterator<Object> iter, final Object self, final Object... args) {
    final Object  callbackfn          = args.length > 0 ? args[0] : ScriptRuntime.UNDEFINED;
    final boolean initialValuePresent = args.length > 1;

    Object initialValue = initialValuePresent ? args[1] : ScriptRuntime.UNDEFINED;

    if (callbackfn == ScriptRuntime.UNDEFINED) {
        throw typeError("not.a.function", "undefined");
    }

    if (!initialValuePresent) {
        if (iter.hasNext()) {
            initialValue = iter.next();
        } else {
            throw typeError("array.reduce.invalid.init");
        }
    }

    //if initial value is ScriptRuntime.UNDEFINED - step forward once.
    return new IteratorAction<Object>(Global.toObject(self), callbackfn, ScriptRuntime.UNDEFINED, initialValue, iter) {
        private final MethodHandle reduceInvoker = getREDUCE_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final long i) throws Throwable {
            // TODO: why can't I declare the second arg as Undefined.class?
            result = reduceInvoker.invokeExact(callbackfn, ScriptRuntime.UNDEFINED, result, val, i, self);
            return true;
        }
    }.apply();
}
 

private static Object reduceInner(final ArrayLikeIterator<Object> iter, final Object self, final Object... args) {
    final Object  callbackfn          = args.length > 0 ? args[0] : ScriptRuntime.UNDEFINED;
    final boolean initialValuePresent = args.length > 1;

    Object initialValue = initialValuePresent ? args[1] : ScriptRuntime.UNDEFINED;

    if (callbackfn == ScriptRuntime.UNDEFINED) {
        throw typeError("not.a.function", "undefined");
    }

    if (!initialValuePresent) {
        if (iter.hasNext()) {
            initialValue = iter.next();
        } else {
            throw typeError("array.reduce.invalid.init");
        }
    }

    //if initial value is ScriptRuntime.UNDEFINED - step forward once.
    return new IteratorAction<Object>(Global.toObject(self), callbackfn, ScriptRuntime.UNDEFINED, initialValue, iter) {
        private final MethodHandle reduceInvoker = getREDUCE_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final double i) throws Throwable {
            // TODO: why can't I declare the second arg as Undefined.class?
            result = reduceInvoker.invokeExact(callbackfn, ScriptRuntime.UNDEFINED, result, val, i, self);
            return true;
        }
    }.apply();
}
 

private static Object reduceInner(final ArrayLikeIterator<Object> iter, final Object self, final Object... args) {
    final Object  callbackfn          = args.length > 0 ? args[0] : ScriptRuntime.UNDEFINED;
    final boolean initialValuePresent = args.length > 1;

    Object initialValue = initialValuePresent ? args[1] : ScriptRuntime.UNDEFINED;

    if (callbackfn == ScriptRuntime.UNDEFINED) {
        throw typeError("not.a.function", "undefined");
    }

    if (!initialValuePresent) {
        if (iter.hasNext()) {
            initialValue = iter.next();
        } else {
            throw typeError("array.reduce.invalid.init");
        }
    }

    //if initial value is ScriptRuntime.UNDEFINED - step forward once.
    return new IteratorAction<Object>(Global.toObject(self), callbackfn, ScriptRuntime.UNDEFINED, initialValue, iter) {
        private final MethodHandle reduceInvoker = getREDUCE_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final double i) throws Throwable {
            // TODO: why can't I declare the second arg as Undefined.class?
            result = reduceInvoker.invokeExact(callbackfn, ScriptRuntime.UNDEFINED, result, val, i, self);
            return true;
        }
    }.apply();
}
 

private static Object reduceInner(final ArrayLikeIterator<Object> iter, final Object self, final Object... args) {
    final Object  callbackfn          = args.length > 0 ? args[0] : ScriptRuntime.UNDEFINED;
    final boolean initialValuePresent = args.length > 1;

    Object initialValue = initialValuePresent ? args[1] : ScriptRuntime.UNDEFINED;

    if (callbackfn == ScriptRuntime.UNDEFINED) {
        throw typeError("not.a.function", "undefined");
    }

    if (!initialValuePresent) {
        if (iter.hasNext()) {
            initialValue = iter.next();
        } else {
            throw typeError("array.reduce.invalid.init");
        }
    }

    //if initial value is ScriptRuntime.UNDEFINED - step forward once.
    return new IteratorAction<Object>(Global.toObject(self), callbackfn, ScriptRuntime.UNDEFINED, initialValue, iter) {
        private final MethodHandle reduceInvoker = getREDUCE_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final double i) throws Throwable {
            // TODO: why can't I declare the second arg as Undefined.class?
            result = reduceInvoker.invokeExact(callbackfn, ScriptRuntime.UNDEFINED, result, val, i, self);
            return true;
        }
    }.apply();
}
 

/**
 * Converts {@code result} to a printable string. The reason we don't use {@link JSType#toString(Object)}
 * or {@link ScriptRuntime#safeToString(Object)} is that we want to be able to render Symbol values
 * even if they occur within an Array, and therefore have to implement our own Array to String
 * conversion.
 *
 * @param result the result
 * @param global the global object
 * @return the string representation
 */
protected static String toString(final Object result, final Global global) {
    if (result instanceof Symbol) {
        // Normal implicit conversion of symbol to string would throw TypeError
        return result.toString();
    }

    if (result instanceof NativeSymbol) {
        return JSType.toPrimitive(result).toString();
    }

    if (isArrayWithDefaultToString(result, global)) {
        // This should yield the same string as Array.prototype.toString but
        // will not throw if the array contents include symbols.
        final StringBuilder sb = new StringBuilder();
        final Iterator<Object> iter = ArrayLikeIterator.arrayLikeIterator(result, true);

        while (iter.hasNext()) {
            final Object obj = iter.next();

            if (obj != null && obj != ScriptRuntime.UNDEFINED) {
                sb.append(toString(obj, global));
            }

            if (iter.hasNext()) {
                sb.append(',');
            }
        }

        return sb.toString();
    }

    return JSType.toString(result);
}
 

private static Object reduceInner(final ArrayLikeIterator<Object> iter, final Object self, final Object... args) {
    final Object  callbackfn          = args.length > 0 ? args[0] : ScriptRuntime.UNDEFINED;
    final boolean initialValuePresent = args.length > 1;

    Object initialValue = initialValuePresent ? args[1] : ScriptRuntime.UNDEFINED;

    if (callbackfn == ScriptRuntime.UNDEFINED) {
        throw typeError("not.a.function", "undefined");
    }

    if (!initialValuePresent) {
        if (iter.hasNext()) {
            initialValue = iter.next();
        } else {
            throw typeError("array.reduce.invalid.init");
        }
    }

    //if initial value is ScriptRuntime.UNDEFINED - step forward once.
    return new IteratorAction<Object>(Global.toObject(self), callbackfn, ScriptRuntime.UNDEFINED, initialValue, iter) {
        private final MethodHandle reduceInvoker = getREDUCE_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final double i) throws Throwable {
            // TODO: why can't I declare the second arg as Undefined.class?
            result = reduceInvoker.invokeExact(callbackfn, ScriptRuntime.UNDEFINED, result, val, i, self);
            return true;
        }
    }.apply();
}
 

private static Object reduceInner(final ArrayLikeIterator<Object> iter, final Object self, final Object... args) {
    final Object  callbackfn          = args.length > 0 ? args[0] : ScriptRuntime.UNDEFINED;
    final boolean initialValuePresent = args.length > 1;

    Object initialValue = initialValuePresent ? args[1] : ScriptRuntime.UNDEFINED;

    if (callbackfn == ScriptRuntime.UNDEFINED) {
        throw typeError("not.a.function", "undefined");
    }

    if (!initialValuePresent) {
        if (iter.hasNext()) {
            initialValue = iter.next();
        } else {
            throw typeError("array.reduce.invalid.init");
        }
    }

    //if initial value is ScriptRuntime.UNDEFINED - step forward once.
    return new IteratorAction<Object>(Global.toObject(self), callbackfn, ScriptRuntime.UNDEFINED, initialValue, iter) {
        private final MethodHandle reduceInvoker = getREDUCE_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final long i) throws Throwable {
            // TODO: why can't I declare the second arg as Undefined.class?
            result = reduceInvoker.invokeExact(callbackfn, ScriptRuntime.UNDEFINED, result, val, i, self);
            return true;
        }
    }.apply();
}
 

private static Object reduceInner(final ArrayLikeIterator<Object> iter, final Object self, final Object... args) {
    final Object  callbackfn          = args.length > 0 ? args[0] : ScriptRuntime.UNDEFINED;
    final boolean initialValuePresent = args.length > 1;

    Object initialValue = initialValuePresent ? args[1] : ScriptRuntime.UNDEFINED;

    if (callbackfn == ScriptRuntime.UNDEFINED) {
        throw typeError("not.a.function", "undefined");
    }

    if (!initialValuePresent) {
        if (iter.hasNext()) {
            initialValue = iter.next();
        } else {
            throw typeError("array.reduce.invalid.init");
        }
    }

    //if initial value is ScriptRuntime.UNDEFINED - step forward once.
    return new IteratorAction<Object>(Global.toObject(self), callbackfn, ScriptRuntime.UNDEFINED, initialValue, iter) {
        private final MethodHandle reduceInvoker = getREDUCE_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final long i) throws Throwable {
            // TODO: why can't I declare the second arg as Undefined.class?
            result = reduceInvoker.invokeExact(callbackfn, ScriptRuntime.UNDEFINED, result, val, i, self);
            return true;
        }
    }.apply();
}
 

private static Object reduceInner(final ArrayLikeIterator<Object> iter, final Object self, final Object... args) {
    final Object  callbackfn          = args.length > 0 ? args[0] : ScriptRuntime.UNDEFINED;
    final boolean initialValuePresent = args.length > 1;

    Object initialValue = initialValuePresent ? args[1] : ScriptRuntime.UNDEFINED;

    if (callbackfn == ScriptRuntime.UNDEFINED) {
        throw typeError("not.a.function", "undefined");
    }

    if (!initialValuePresent) {
        if (iter.hasNext()) {
            initialValue = iter.next();
        } else {
            throw typeError("array.reduce.invalid.init");
        }
    }

    //if initial value is ScriptRuntime.UNDEFINED - step forward once.
    return new IteratorAction<Object>(Global.toObject(self), callbackfn, ScriptRuntime.UNDEFINED, initialValue, iter) {
        private final MethodHandle reduceInvoker = getREDUCE_CALLBACK_INVOKER();

        @Override
        protected boolean forEach(final Object val, final double i) throws Throwable {
            // TODO: why can't I declare the second arg as Undefined.class?
            result = reduceInvoker.invokeExact(callbackfn, ScriptRuntime.UNDEFINED, result, val, i, self);
            return true;
        }
    }.apply();
}