You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
31 lines
1.0 KiB
31 lines
1.0 KiB
'use strict';
|
|
// https://tc39.github.io/proposal-setmap-offrom/
|
|
var bind = require('../internals/function-bind-context');
|
|
var call = require('../internals/function-call');
|
|
var aCallable = require('../internals/a-callable');
|
|
var aConstructor = require('../internals/a-constructor');
|
|
var isNullOrUndefined = require('../internals/is-null-or-undefined');
|
|
var iterate = require('../internals/iterate');
|
|
|
|
var push = [].push;
|
|
|
|
module.exports = function from(source /* , mapFn, thisArg */) {
|
|
var length = arguments.length;
|
|
var mapFn = length > 1 ? arguments[1] : undefined;
|
|
var mapping, array, n, boundFunction;
|
|
aConstructor(this);
|
|
mapping = mapFn !== undefined;
|
|
if (mapping) aCallable(mapFn);
|
|
if (isNullOrUndefined(source)) return new this();
|
|
array = [];
|
|
if (mapping) {
|
|
n = 0;
|
|
boundFunction = bind(mapFn, length > 2 ? arguments[2] : undefined);
|
|
iterate(source, function (nextItem) {
|
|
call(push, array, boundFunction(nextItem, n++));
|
|
});
|
|
} else {
|
|
iterate(source, push, { that: array });
|
|
}
|
|
return new this(array);
|
|
};
|
|
|