TypedArrayConstructor.js [plain text]
function of()
{
"use strict";
var len = arguments.length;
if (!@isConstructor(this))
@throwTypeError("TypedArray.of requires |this| to be a constructor");
var result = new this(len);
if (@typedArrayLength(result) < len)
@throwTypeError("TypedArray.of constructed typed array of insufficient length");
for (var i = 0; i < len; i++)
result[i] = arguments[i];
return result;
}
function from(items )
{
"use strict";
if (!@isConstructor(this))
@throwTypeError("TypedArray.from requires |this| to be a constructor");
var mapFn = @argument(1);
var thisArg;
if (mapFn !== @undefined) {
if (!@isCallable(mapFn))
@throwTypeError("TypedArray.from requires that the second argument, when provided, be a function");
thisArg = @argument(2);
}
var arrayLike = @toObject(items, "TypedArray.from requires an array-like object - not null or undefined");
var iteratorMethod = items.@@iterator;
if (!@isUndefinedOrNull(iteratorMethod)) {
if (!@isCallable(iteratorMethod))
@throwTypeError("TypedArray.from requires that the property of the first argument, items[Symbol.iterator], when exists, be a function");
var accumulator = [];
var count = 0;
var iterator = iteratorMethod.@call(items);
var wrapper = {};
wrapper.@@iterator = function() { return iterator; }
for (var value of wrapper) {
@putByValDirect(accumulator, count, value);
count++;
}
var result = new this(count);
if (@typedArrayLength(result) < count)
@throwTypeError("TypedArray.from constructed typed array of insufficient length");
for (var k = 0; k < count; k++) {
var value = accumulator[k];
if (mapFn)
result[k] = thisArg === @undefined ? mapFn(value, k) : mapFn.@call(thisArg, value, k);
else
result[k] = value;
}
return result;
}
var arrayLikeLength = @toLength(arrayLike.length);
var result = new this(arrayLikeLength);
if (@typedArrayLength(result) < arrayLikeLength)
@throwTypeError("TypedArray.from constructed typed array of insufficient length");
for (var k = 0; k < arrayLikeLength; k++) {
var value = arrayLike[k];
if (mapFn)
result[k] = thisArg === @undefined ? mapFn(value, k) : mapFn.@call(thisArg, value, k);
else
result[k] = value;
}
return result;
}