dSalieri

function slice(arr) {
    arr = createArrayFromArrayLike(arr);
    return function (start, end, flag) {
    let boundary1 = typeof start === "boolean" || start === undefined || arr.length + start < 0 ? 0 : start < 0 ? arr.length + start : start > arr.length ? arr.length : start;
    let boundary2 = typeof end === "boolean" || end === undefined || end > arr.length ? arr.length : end > 0 ? end : arr.length + end < 0 ? 0 : arr.length + end;
        let inverseFlag = typeof start === "boolean" ? start : typeof end === "boolean" ? end : flag;
        let shift = boundary2 - boundary1;
        if (inverseFlag) {
            let slicedArr = Array(arr.length - shift);
            let key = 0;