17 lines
653 B
JavaScript
17 lines
653 B
JavaScript
const require_isArrayLike = require("../predicate/isArrayLike.js");
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const require_iteratee = require("../util/iteratee.js");
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//#region src/compat/array/countBy.ts
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function countBy(collection, iteratee$1) {
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if (collection == null) return {};
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const array = require_isArrayLike.isArrayLike(collection) ? Array.from(collection) : Object.values(collection);
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const mapper = require_iteratee.iteratee(iteratee$1 ?? void 0);
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const result = Object.create(null);
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for (let i = 0; i < array.length; i++) {
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const item = array[i];
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const key = mapper(item);
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result[key] = (result[key] ?? 0) + 1;
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}
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return result;
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}
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//#endregion
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exports.countBy = countBy;
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