21 lines
503 B
JavaScript
21 lines
503 B
JavaScript
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var each = require('./each');
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var isArray = require('./type/is-array');
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var hasOwnProperty = Object.prototype.hasOwnProperty;
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var groupBy = function groupBy(data, condition) {
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if (!condition || !isArray(data)) {
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return data;
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}
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var result = {};
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var key = null;
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each(data, function (item) {
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key = condition(item);
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if (hasOwnProperty.call(result, key)) {
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result[key].push(item);
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} else {
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result[key] = [item];
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}
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});
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return result;
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};
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module.exports = groupBy;
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