文件操作 - esnext.iterator.reduce.js
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文件: /node_modules/core-js/modules/esnext.iterator.reduce.js
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'use strict'; // https://github.com/tc39/proposal-iterator-helpers var $ = require('../internals/export'); var iterate = require('../internals/iterate'); var aFunction = require('../internals/a-function'); var anObject = require('../internals/an-object'); $({ target: 'Iterator', proto: true, real: true }, { reduce: function reduce(reducer /* , initialValue */) { anObject(this); aFunction(reducer); var noInitial = arguments.length < 2; var accumulator = noInitial ? undefined : arguments[1]; iterate(this, function (value) { if (noInitial) { noInitial = false; accumulator = value; } else { accumulator = reducer(accumulator, value); } }, undefined, false, true); if (noInitial) throw TypeError('Reduce of empty iterator with no initial value'); return accumulator; } });
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