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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 aTypedArrayConstructor = require('../internals/array-buffer-view-core').aTypedArrayConstructor;
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, 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);
for (i = 0; length > i; i++) {
result[i] = mapping ? mapfn(O[i], i) : O[i];
}
return result;
};