codiltity02-02.js

codiltity02-02.js

function solution(arr) {
    // write your code in JavaScript (Node.js 8.9.4)
    const reducer = (a, c, ci, ar) => {
        console.log('asdasda', a, c, ci, ar);
        if (a.length === 0) {
            const filtered = ar.filter(el => el !== c)
            return filtered;
        }
        if (a.length === 1) return a;
        return a.filter(el => el !== c)
    }
    const result = arr.reduce(reducer, [])
    return result[0];
}
console.log(solution([1, 1, 1, 1, 1, 1, 1, 1, 1, 9]));

function solution2(arr) {
    // write your code in JavaScript (Node.js 8.9.4)
    while (arr.length > 1) {
        let filterItem = arr[0];
        arr = arr.filter(el => el !== filterItem)
    }
    return arr[0];
}


function solution3(arr) {
    // write your code in JavaScript (Node.js 8.9.4)
    let result = 0;
    arr.forEach(element => {
        if (arr.indexOf(element) === arr.lastIndexOf(element)) {
            return result = element
        }
    });
    return result;

}

function solution4(arr) {
    // write your code in JavaScript (Node.js 8.9.4)
    while (arr.length > 1) {
        let filterItem = arr[0];
        arr = arr.filter(el => el !== filterItem)
    }
    return arr[0];
}
function solution5(a) {
    // write your code in JavaScript (Node.js 8.9.4)

    const converted = a.reduce(function (obj, v) {
        if (!obj[v]) obj[v] = 1;
        else {
            obj[v] = obj[v] + 1
        }
        return obj;
    }, {})
    for (key in converted) {
        if (converted[key] === 1) {
            return parseInt(key);
        }
    }
 
}

//