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10 lines
340 B
10 lines
340 B
3 years ago
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import group from './_group.js';
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import has from './_has.js';
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// Counts instances of an object that group by a certain criterion. Pass
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// either a string attribute to count by, or a function that returns the
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// criterion.
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export default group(function(result, value, key) {
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if (has(result, key)) result[key]++; else result[key] = 1;
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});
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