1 | import isArray from './is-array';
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2 | import isFunction from './is-function';
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3 | var hasOwnProperty = Object.prototype.hasOwnProperty;
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4 | function groupBy(data, condition) {
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5 | if (!condition || !isArray(data)) {
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6 | return {};
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7 | }
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8 | var result = {};
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9 |
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10 | var predicate = isFunction(condition) ? condition : function (item) { return item[condition]; };
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11 | var key;
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12 | for (var i = 0; i < data.length; i++) {
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13 | var item = data[i];
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14 | key = predicate(item);
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15 | if (hasOwnProperty.call(result, key)) {
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16 | result[key].push(item);
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17 | }
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18 | else {
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19 | result[key] = [item];
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20 | }
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21 | }
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22 | return result;
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23 | }
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24 | export default groupBy;
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25 |
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