HalfSum

function solve(arr) {

    var firstArray = 0;
    var secondArray = 0;


    for (var i = 0; i < arr.length / 2; i++) {
        firstArray += arr[i];
    }
    for (var j = arr.length/2; j < arr.length; j++) {
        secondArray += arr[j]
    }
    var diff = firstArray - secondArray;
    if (firstArray == secondArray) {
        console.log ("Yes, sum="+firstArray)
    }
    else if (diff < 0) {
        console.log("No, diff=" + -diff)
    }
    else {
        console.log("No, diff=" + diff)
    }


}
solve([3, 4, -1, -1, 2, 1, 1, 1]);
solve([1, 2, 3, 1, 2, 2]);
solve([1, 1, 0, 0]);