77 lines
1.5 KiB
JavaScript
77 lines
1.5 KiB
JavaScript
"use strict";
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/* Array utilities. */
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var arrays = {
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range: function(start, stop) {
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var length = stop - start,
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result = new Array(length),
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i, j;
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for (i = 0, j = start; i < length; 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, valueOrPredicate) {
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var length = array.length, i;
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if (typeof valueOrPredicate === "function") {
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for (i = 0; i < length; i++) {
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if (valueOrPredicate(array[i])) {
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return array[i];
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}
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}
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} else {
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for (i = 0; i < length; i++) {
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if (array[i] === valueOrPredicate) {
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return array[i];
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}
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}
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}
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},
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indexOf: function(array, valueOrPredicate) {
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var length = array.length, i;
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if (typeof valueOrPredicate === "function") {
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for (i = 0; i < length; i++) {
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if (valueOrPredicate(array[i])) {
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return i;
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}
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}
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} else {
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for (i = 0; i < length; i++) {
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if (array[i] === valueOrPredicate) {
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return i;
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}
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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, valueOrPredicate) {
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return arrays.indexOf(array, valueOrPredicate) !== -1;
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},
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pluck: function(array, key) {
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return array.map(function (e) { return e[key]; });
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},
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some: function(array, predicate) {
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var length = array.length, i;
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for (i = 0; i < length; i++) {
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if (predicate(array[i])) {
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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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};
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module.exports = arrays;
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