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let insertionSort = (arr) => {
    for (let i = 0; i < a.length; i++) {
        let toCmp = arr[i];
        for (let j = i; j > 0 && toCmp < a[j - 1]; j--)
            arr[j] = a[j - 1];
        arr[j] = toCmp;
    }
    return arr;
}