Codility: OddOccurrencesInArray Solution
Lesson 2 Arrays1function solution(A) {2 const group = A.reduce((acc, el) => {3 acc.set(el, (acc.get(el) || 0) + 1)4 return acc5 }, new Map())6 for (const g of group) {7 if (g[1] % 2 !== 0) {8 return g[0]9 }10 }11}
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