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Dir : ~/usr/share/nodejs/core-js/internals/

View File Name : typed-array-from.js

var bind = require('../internals/function-bind-context');
var call = require('../internals/function-call');
var aConstructor = require('../internals/a-constructor');
var toObject = require('../internals/to-object');
var lengthOfArrayLike = require('../internals/length-of-array-like');
var getIterator = require('../internals/get-iterator');
var getIteratorMethod = require('../internals/get-iterator-method');
var isArrayIteratorMethod = require('../internals/is-array-iterator-method');
var isBigIntArray = require('../internals/is-big-int-array');
var aTypedArrayConstructor = require('../internals/array-buffer-view-core').aTypedArrayConstructor;
var toBigInt = require('../internals/to-big-int');

module.exports = function from(source /* , mapfn, thisArg */) {
  var C = aConstructor(this);
  var O = toObject(source);
  var argumentsLength = arguments.length;
  var mapfn = argumentsLength > 1 ? arguments[1] : undefined;
  var mapping = mapfn !== undefined;
  var iteratorMethod = getIteratorMethod(O);
  var i, length, result, thisIsBigIntArray, value, step, iterator, next;
  if (iteratorMethod && !isArrayIteratorMethod(iteratorMethod)) {
    iterator = getIterator(O, iteratorMethod);
    next = iterator.next;
    O = [];
    while (!(step = call(next, iterator)).done) {
      O.push(step.value);
    }
  }
  if (mapping && argumentsLength > 2) {
    mapfn = bind(mapfn, arguments[2]);
  }
  length = lengthOfArrayLike(O);
  result = new (aTypedArrayConstructor(C))(length);
  thisIsBigIntArray = isBigIntArray(result);
  for (i = 0; length > i; i++) {
    value = mapping ? mapfn(O[i], i) : O[i];
    // FF30- typed arrays doesn't properly convert objects to typed array values
    result[i] = thisIsBigIntArray ? toBigInt(value) : +value;
  }
  return result;
};