Use PHP functions in JavaScript

JavaScript array_slice

Returns elements specified by offset and length

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function array_slice (arr, offst, lgth, preserve_keys) {
    // Returns elements specified by offset and length  
    // 
    // version: 911.815
    // discuss at: http://phpjs.org/functions/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 (!(arr instanceof 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);    }
}
external links: original PHP docs | raw js source

Examples

» Example 1

Running

1
array_slice(["a", "b", "c", "d", "e"], 2, -1);

Should return

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{0: 'c', 1: 'd'}

» Example 2

Running

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array_slice(["a", "b", "c", "d", "e"], 2, -1, true);

Should return

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{2: 'c', 3: 'd'}

Dependencies

In order to use this function, you also need:

Open syntax issues

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Authors

Thanks to the following developers, you get to have array_slice goodness in JavaScript.

Comments

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