JS-code/codility/src/script3.js at master · Vitaminvp/JS-code · GitHub

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function solution(N) {

// write your code in JavaScript (Node.js 8.9.4)

const obj = {};

N.map(item => {

if(obj[item]){

obj[item] = obj[item]+1;

}else{

obj[item] = 1;

}

});

console.log("obj", obj);

for(let key in obj){

if(obj[key] % 2) return key;

}

return -1;

}

let A = [9, 3, 9, 3, 9, 7, 9];

let B = [1, 3, 9, 3, 9, 7, 9, 7, 7, 6, 9, 6, 1, 2];

console.log("solution(A)", solution(A));

console.log("solution(B)", solution(B));

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