View: array_splice

Function:
Description: Removes the elements designated by offset and length and replace them with supplied array.
Code
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function array_splice (arr, offst, lgth, replacement) {
    // http://jsphp.co/jsphp/fn/view/array_splice
    // +   original by: Brett Zamir (http://brett-zamir.me)
    // +   input by: Theriault
    // %        note 1: Order does get shifted in associative array input with numeric indices,
    // %        note 1: since PHP behavior doesn't preserve keys, but I understand order is
    // %        note 1: not reliable anyways
    // %        note 2: Note also that IE retains information about property position even
    // %        note 2: after being supposedly deleted, so use of this function may produce
    // %        note 2: unexpected results in IE if you later attempt to add back properties
    // %        note 2: with the same keys that had been deleted
    // -    depends on: is_int
    // *     example 1: input = {4: "red", 'abc': "green", 2: "blue", 'dud': "yellow"};
    // *     example 1: array_splice(input, 2);
    // *     returns 1: {0: "blue", 'dud': "yellow"}
    // *     results 1: input == {'abc':"green", 0:"red"}
    // *     example 2: input = ["red", "green", "blue", "yellow"];
    // *     example 2: array_splice(input, 3, 0, "purple");
    // *     returns 2: []
    // *     results 2: input == ["red", "green", "blue", "purple", "yellow"]
    // *     example 3: input = ["red", "green", "blue", "yellow"]
    // *     example 3: array_splice(input, -1, 1, ["black", "maroon"]);
    // *     returns 3: ["yellow"]
    // *     results 3: input == ["red", "green", "blue", "black", "maroon"]
    var _checkToUpIndices = function (arr, ct, key) {
        // Deal with situation, e.g., if encounter index 4 and try to set it to 0, but 0 exists later in loop (need to
        // increment all subsequent (skipping current key, since we need its value below) until find unused)
        if (arr[ct] !== undefined) {
            var tmp = ct;
            ct += 1;
            if (ct === key) {
                ct += 1;
            }
            ct = _checkToUpIndices(arr, ct, key);
            arr[ct] = arr[tmp];
            delete arr[tmp];
        }
        return ct;
    };

    if (replacement && typeof replacement !== 'object') {
        replacement = [replacement];
    }
    if (lgth === undefined) {
        lgth = offst >= 0 ? arr.length - offst : -offst;
    } else if (lgth < 0) {
        lgth = (offst >= 0 ? arr.length - offst : -offst) + lgth;
    }

    if (Object.prototype.toString.call(arr) !== '[object Array]') {
/*if (arr.length !== undefined) { // Deal with array-like objects as input
        delete arr.length;
        }*/
        var lgt = 0,
            ct = -1,
            rmvd = [],
            rmvdObj = {},
            repl_ct = -1,
            int_ct = -1;
        var returnArr = true,
            rmvd_ct = 0,
            rmvd_lgth = 0,
            key = '';
        // rmvdObj.length = 0;
        for (key in arr) { // Can do arr.__count__ in some browsers
            lgt += 1;
        }
        offst = (offst >= 0) ? offst : lgt + offst;
        for (key in arr) {
            ct += 1;
            if (ct < offst) {
                if (this.is_int(key)) {
                    int_ct += 1;
                    if (parseInt(key, 10) === int_ct) { // Key is already numbered ok, so don't need to change key for value
                        continue;
                    }
                    _checkToUpIndices(arr, int_ct, key); // Deal with situation, e.g.,
                    // if encounter index 4 and try to set it to 0, but 0 exists later in loop
                    arr[int_ct] = arr[key];
                    delete arr[key];
                }
                continue;
            }
            if (returnArr && this.is_int(key)) {
                rmvd.push(arr[key]);
                rmvdObj[rmvd_ct++] = arr[key]; // PHP starts over here too
            } else {
                rmvdObj[key] = arr[key];
                returnArr = false;
            }
            rmvd_lgth += 1;
            // rmvdObj.length += 1;
            if (replacement && replacement[++repl_ct]) {
                arr[key] = replacement[repl_ct];
            } else {
                delete arr[key];
            }
        }
        // arr.length = lgt - rmvd_lgth + (replacement ? replacement.length : 0); // Make (back) into an array-like object
        return returnArr ? rmvd : rmvdObj;
    }

    if (replacement) {
        replacement.unshift(offst, lgth);
        return Array.prototype.splice.apply(arr, replacement);
    }
    return arr.splice(offst, lgth);
}
Comment on array_splice version 38
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