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rOACCT/node_modules/core-js/modules/esnext.iterator.flat-map.js
dd570dbc4621master

esnext.iterator.flat-map.js
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			'use strict';
			var $ = require('../internals/export');
			var call = require('../internals/function-call');
			var aCallable = require('../internals/a-callable');
			var anObject = require('../internals/an-object');
			var getIteratorDirect = require('../internals/get-iterator-direct');
			var getIteratorFlattenable = require('../internals/get-iterator-flattenable');
			var createIteratorProxy = require('../internals/iterator-create-proxy');
			var iteratorClose = require('../internals/iterator-close');

			var IteratorProxy = createIteratorProxy(function () {
			var iterator = this.iterator;
			var mapper = this.mapper;
			var result, inner;

			while (true) {
			if (inner = this.inner) try {
			result = anObject(call(inner.next, inner.iterator));
			if (!result.done) return result.value;
			this.inner = null;
			} catch (error) { iteratorClose(iterator, 'throw', error); }

			result = anObject(call(this.next, iterator));

			if (this.done = !!result.done) return;

			try {
			this.inner = getIteratorFlattenable(mapper(result.value, this.counter++));
			} catch (error) { iteratorClose(iterator, 'throw', error); }
			}
			});

			// `Iterator.prototype.flatMap` method
			// https://github.com/tc39/proposal-iterator-helpers
			$({ target: 'Iterator', proto: true, real: true }, {
			flatMap: function flatMap(mapper) {
			return new IteratorProxy(getIteratorDirect(this), {
			mapper: aCallable(mapper),
			inner: null
			});
			}
			});