9 lines
277 B
JavaScript
9 lines
277 B
JavaScript
// https://www.codewars.com/kata/counting-duplicates/javascript
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function duplicateCount(text) {
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const m = text.toLowerCase().match(/[a-z0-9]/g) || [];
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const cnt = new Map();
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m.map(c => cnt.set(c, (cnt.get(c) || 0) + 1));
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return [...cnt].filter(([k,v])=>1<v).length;
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}
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