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'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)
});
}
});
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