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52
node_modules/core-js/modules/es.iterator.reduce.js
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52
node_modules/core-js/modules/es.iterator.reduce.js
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'use strict';
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var $ = require('../internals/export');
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var iterate = require('../internals/iterate');
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var aCallable = require('../internals/a-callable');
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var anObject = require('../internals/an-object');
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var getIteratorDirect = require('../internals/get-iterator-direct');
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var iteratorClose = require('../internals/iterator-close');
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var iteratorHelperWithoutClosingOnEarlyError = require('../internals/iterator-helper-without-closing-on-early-error');
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var apply = require('../internals/function-apply');
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var fails = require('../internals/fails');
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var $TypeError = TypeError;
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// https://bugs.webkit.org/show_bug.cgi?id=291651
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var FAILS_ON_INITIAL_UNDEFINED = fails(function () {
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// eslint-disable-next-line es/no-iterator-prototype-reduce, es/no-array-prototype-keys, array-callback-return -- required for testing
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[].keys().reduce(function () { /* empty */ }, undefined);
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});
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var reduceWithoutClosingOnEarlyError = !FAILS_ON_INITIAL_UNDEFINED && iteratorHelperWithoutClosingOnEarlyError('reduce', $TypeError);
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// `Iterator.prototype.reduce` method
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// https://tc39.es/ecma262/#sec-iterator.prototype.reduce
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$({ target: 'Iterator', proto: true, real: true, forced: FAILS_ON_INITIAL_UNDEFINED || reduceWithoutClosingOnEarlyError }, {
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reduce: function reduce(reducer /* , initialValue */) {
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anObject(this);
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try {
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aCallable(reducer);
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} catch (error) {
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iteratorClose(this, 'throw', error);
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}
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var noInitial = arguments.length < 2;
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var accumulator = noInitial ? undefined : arguments[1];
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if (reduceWithoutClosingOnEarlyError) {
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return apply(reduceWithoutClosingOnEarlyError, this, noInitial ? [reducer] : [reducer, accumulator]);
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}
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var record = getIteratorDirect(this);
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var counter = 0;
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iterate(record, function (value) {
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if (noInitial) {
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noInitial = false;
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accumulator = value;
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} else {
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accumulator = reducer(accumulator, value, counter);
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}
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counter++;
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}, { IS_RECORD: true });
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if (noInitial) throw new $TypeError('Reduce of empty iterator with no initial value');
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return accumulator;
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}
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});
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