'use strict';
// https://tc39.github.io/proposal-setmap-offrom/
-var aFunction = require('../internals/a-function');
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 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;
- aFunction(this);
+ aConstructor(this);
mapping = mapFn !== undefined;
- if (mapping) aFunction(mapFn);
+ if (mapping) aCallable(mapFn);
if (source == undefined) return new this();
array = [];
if (mapping) {
n = 0;
- boundFunction = bind(mapFn, length > 2 ? arguments[2] : undefined, 2);
+ boundFunction = bind(mapFn, length > 2 ? arguments[2] : undefined);
iterate(source, function (nextItem) {
- array.push(boundFunction(nextItem, n++));
+ call(push, array, boundFunction(nextItem, n++));
});
} else {
- iterate(source, array.push, { that: array });
+ iterate(source, push, { that: array });
}
return new this(array);
};