slice.js #1

    /**
     * Create slice of source array or array-like object
     */
    function slice(arr, start, end){
        var len = arr.length;

        if (start == null) {
            start = 0;
        } else if (start < 0) {
            start = Math.max(len + start, 0);
        } else {
            start = Math.min(start, len);
        }

        if (end == null) {
            end = len;
        } else if (end < 0) {
            end = Math.max(len + end, 0);
        } else {
            end = Math.min(end, len);
        }

        var result = [];
        while (start < end) {
            result.push(arr[start++]);
        }

        return result;
    }

    module.exports = slice;