Question

Need a function which return next N elements from given array, with given offset, but when offset larger then array length, it must return elements at the beginning of array.

Interface:
slice2(array, chunk, offset);

Examples:

var array = [1,2,3,4,5];
slice2(array,2,2) Output: [3,4]
slice2(array,2,4) Output: [5,1]
slice2(array,3,4) Output: [5,1,2]

Answer 1

function slice2(array, chunk, offset) {
    var subarray = [];
    for (var i = 0; i<chunk; i++) {
        var ind = (offset + i) % array.length;
        subarray.push(array[ind]);
    }

    return subarray;
}