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CODE EXAMPLE FOR JAVASCRIPT

check if number appears odd number of times in array javascript

function findOdd(A) {
    let counts = A.reduce((p, n) => (p[n] = ++p[n] || 1, p), {});
    return +Object.keys(counts).find(k => counts[k] % 2) || undefined;
}
 
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Tagged: #check #number #appears #odd #number #times #array #javascript
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