JavaScript array_slice
Returns elements specified by offset and length
1 2 3 4 56 7 8 9 1011 12 13 14 1516 17 18 19 2021 22 23 24 2526 27 28 29 3031 32 33 34 3536 37 38 39 4041 42 43 44 4546 47 48 49 5051 52 53 54 5556 57 58 59 6061 62 63 64 6566 67 | 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); } } |
Examples
» Example 1
Running
1 | array_slice(["a", "b", "c", "d", "e"], 2, -1); |
Should return
1 | {0: 'c', 1: 'd'} |
» Example 2
Running
1 | array_slice(["a", "b", "c", "d", "e"], 2, -1, true); |
Should return
1 | {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.
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