[Solved] How to compare values of array and if they are equal make them one

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You could reduce the array and check if the previous value is equal to the actual value.

function sumSame(arrayA, arrayB) {
    var i,
        l = arrayA.length,
        resultA = [],
        resultB = [];

    for (i = 0; i < l; i++) {
        if (arrayA[i] === arrayA[i - 1]) {
            resultB[resultB.length - 1] += arrayB[i];
        } else {
            resultA.push(arrayA[i]);
            resultB.push(arrayB[i]);
        }
    }
    return [resultA, resultB];
}

console.log(sumSame(
    [1, 1, 1, 1, 2, 2, 2, 3, 3, 4, 4],
    [0.1, 0.1, 0.1, 0.1, 0.2, 0.2, 0.2, 0.3, 0.3, 0.4, 0.4]
));
.as-console-wrapper { max-height: 100% !important; top: 0; }

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solved How to compare values of array and if they are equal make them one