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72 lines
1.5 KiB
JavaScript
72 lines
1.5 KiB
JavaScript
/* Array utilities. */
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var arrays = {
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/* Like Python's |range|, but without |step|. */
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range: function(start, stop) {
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if (stop === undefined) {
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stop = start;
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start = 0;
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}
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var result = new Array(Math.max(0, stop - start));
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for (var i = 0, j = start; j < stop; i++, j++) {
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result[i] = j;
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}
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return result;
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},
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find: function(array, callback) {
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var length = array.length;
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for (var i = 0; i < length; i++) {
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if (callback(array[i])) {
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return array[i];
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}
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}
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},
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indexOf: function(array, callback) {
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var length = array.length;
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for (var i = 0; i < length; i++) {
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if (callback(array[i])) {
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return i;
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}
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}
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return -1;
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},
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contains: function(array, value) {
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/*
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* Stupid IE does not have Array.prototype.indexOf, otherwise this function
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* would be a one-liner.
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*/
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var length = array.length;
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for (var i = 0; i < length; i++) {
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if (array[i] === value) {
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return true;
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}
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}
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return false;
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},
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each: function(array, callback) {
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var length = array.length;
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for (var i = 0; i < length; i++) {
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callback(array[i], i);
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}
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},
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map: function(array, callback) {
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var result = [];
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var length = array.length;
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for (var i = 0; i < length; i++) {
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result[i] = callback(array[i], i);
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}
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return result;
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},
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pluck: function(array, key) {
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return arrays.map(array, function (e) { return e[key]; });
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}
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};
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module.exports = arrays;
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