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.
23 lines
847 B
23 lines
847 B
'use strict';
|
|
// https://github.com/tc39/proposal-iterator-helpers
|
|
var $ = require('../internals/export');
|
|
var aFunction = require('../internals/a-function');
|
|
var anObject = require('../internals/an-object');
|
|
var createIteratorProxy = require('../internals/iterator-create-proxy');
|
|
var callWithSafeIterationClosing = require('../internals/call-with-safe-iteration-closing');
|
|
|
|
var IteratorProxy = createIteratorProxy(function (arg) {
|
|
var iterator = this.iterator;
|
|
var result = anObject(this.next.call(iterator, arg));
|
|
var done = this.done = !!result.done;
|
|
if (!done) return callWithSafeIterationClosing(iterator, this.mapper, result.value);
|
|
});
|
|
|
|
$({ target: 'Iterator', proto: true, real: true }, {
|
|
map: function map(mapper) {
|
|
return new IteratorProxy({
|
|
iterator: anObject(this),
|
|
mapper: aFunction(mapper)
|
|
});
|
|
}
|
|
});
|
|
|