Edit array_slice version 37 | JsPHP: a JavaScript library providing the PHP API

Function: array_slice version 37

Function:	array_slice View array_slice Edit array_slice Edit code Edit tests Edit benchmark View latest code Edit latest code Benchmark array_slice Comment on array_slice Comment on the latest code View revisions View versions View contributors View dependencies View comments View links Download production code Download development code View the PHP docs View phpjs.org View phpjs.org raw code
Description:	Returns elements specified by offset and length.

Version:	37 View this version Edit this version Comment on this version Diff this version
Status:	latest
Date:	2011-12-20 04:36
Summary:	Import from phpjs.
Programmer:	jj5

Edit function

Code:

function array_slice (arr, offst, lgth, preserve_keys) {
    // http://jsphp.co/jsphp/fn/view/array_slice
    // +   original by: Brett Zamir (http://brett-zamir.me)
    // -    depends on: is_int
    // +      input by: Brett Zamir (http://brett-zamir.me)
    // +   bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // %          note: Relies on is_int because !isNaN accepts floats 
    // *     example 1: array_slice(["a", "b", "c", "d", "e"], 2, -1);
    // *     returns 1: {0: 'c', 1: 'd'}
    // *     example 2: array_slice(["a", "b", "c", "d", "e"], 2, -1, true);
    // *     returns 2: {2: 'c', 3: 'd'}
/*
    if ('callee' in arr && 'length' in arr) {
        arr = Array.prototype.slice.call(arr);
    }
    */

    var key = '';

    if (Object.prototype.toString.call(arr) !== '[object Array]' || 
        (preserve_keys && offst !== 0)) { // Assoc. array as input or if required as output
        var lgt = 0,
            newAssoc = {};
        for (key in arr) {
            //if (key !== 'length') {
            lgt += 1;
            newAssoc[key] = arr[key];
            //}
        }
        arr = newAssoc;

        offst = (offst < 0) ? lgt + offst : offst;
        lgth = lgth === undefined ? lgt : (lgth < 0) ? lgt + lgth - offst : lgth;

        var assoc = {};
        var start = false,
            it = -1,
            arrlgth = 0,
            no_pk_idx = 0;
        for (key in arr) {
            ++it;
            if (arrlgth >= lgth) {
                break;
            }
            if (it == offst) {
                start = true;
            }
            if (!start) {
                continue;
            }++arrlgth;
            if (this.is_int(key) && !preserve_keys) {
                assoc[no_pk_idx++] = arr[key];
            } else {
                assoc[key] = arr[key];
            }
        }
        //assoc.length = arrlgth; // Make as array-like object (though length will not be dynamic)
        return assoc;
    }

    if (lgth === undefined) {
        return arr.slice(offst);
    } else if (lgth >= 0) {
        return arr.slice(offst, offst + lgth);
    } else {
        return arr.slice(offst, lgth);
    }
}

JsPHP: a JavaScript library providing the PHP API

Function: array_slice version 37

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