38 lines
1.1 KiB
JavaScript
38 lines
1.1 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, Symbol.toStringTag, { value: 'Module' });
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const identity = require('../../function/identity.js');
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const range = require('../../math/range.js');
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const isArrayLike = require('../predicate/isArrayLike.js');
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function reduce(collection, iteratee = identity.identity, accumulator) {
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if (!collection) {
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return accumulator;
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}
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let keys;
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let startIndex = 0;
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if (isArrayLike.isArrayLike(collection)) {
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keys = range.range(0, collection.length);
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if (accumulator == null && collection.length > 0) {
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accumulator = collection[0];
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startIndex += 1;
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}
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}
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else {
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keys = Object.keys(collection);
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if (accumulator == null) {
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accumulator = collection[keys[0]];
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startIndex += 1;
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}
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}
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for (let i = startIndex; i < keys.length; i++) {
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const key = keys[i];
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const value = collection[key];
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accumulator = iteratee(accumulator, value, key, collection);
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}
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return accumulator;
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}
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exports.reduce = reduce;
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