Extract monkey-patches
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Andrew Stewart
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aa3332445e
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95
lib/utils.js
95
lib/utils.js
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@ -8,97 +8,8 @@
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"use strict";
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var _ = require("./lodash");
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var addCoreExtensions = function addCoreExtensions() {
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var max = Math.max,
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min = Math.min;
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// Public: Monkey-patches Number to have Rails-like //seconds() function.
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// Warning, due to the way the Javascript parser works, applying functions on
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// numbers is kind of weird. See examples for details.
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//
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// Examples
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//
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// 2.seconds()
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// //=> SyntaxError: Unexpected token ILLEGAL
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//
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// 10..seconds()
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// //=> 10000
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//
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// (5).seconds()
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// //=> 5000
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// // This is the preferred way to represent numbers when calling these
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// // methods on them
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//
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// Returns an integer representing time in milliseconds
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Number.prototype.seconds = function() {
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return this * 1000;
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};
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// Public: Alias for Number::seconds, see comments for that method
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//
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// Examples
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//
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// 1.second()
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// //=> 1000
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//
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// Returns an integer representing time in milliseconds
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Number.prototype.second = function() {
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return this.seconds(this);
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};
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// Public: Convert value from old scale (start, end) to (0..1) scale
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//
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// start - low point of scale to convert value from
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// end - high point of scale to convert value from
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//
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// Examples
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//
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// (5).fromScale(0, 10)
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// //=> 0.5
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//
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// Returns an integer representing the scaled value
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Number.prototype.fromScale = function(start, end) {
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var val = (this - min(start, end)) / (max(start, end) - min(start, end));
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if (val > 1) {
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return 1;
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}
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if (val < 0){
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return 0;
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}
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return val;
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};
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// Public: Convert value from (0..1) scale to new (start, end) scale
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//
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// start - low point of scale to convert value to
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// end - high point of scale to convert value to
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//
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// Examples
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//
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// (0.5).toScale(0, 10)
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// //=> 5
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//
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// Returns an integer representing the scaled value
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Number.prototype.toScale = function(start, end) {
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var i = this * (max(start, end) - min(start, end)) + min(start, end);
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if (i < start) {
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return start;
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}
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if (i > end) {
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return end;
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}
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return i;
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};
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};
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var _ = require("./lodash"),
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monkeyPatches = require("./utils/monkey-patches");
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var Utils = module.exports = {
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// Public: Alias to setInterval, combined with Number monkeypatches below to
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@ -327,7 +238,7 @@ var Utils = module.exports = {
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global.after = this.after;
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global.constantly = this.constantly;
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addCoreExtensions();
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monkeyPatches.install();
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return this;
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}
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@ -0,0 +1,92 @@
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"use strict";
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var max = Math.max,
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min = Math.min;
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module.exports.install = function() {
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// Public: Monkey-patches Number to have Rails-like //seconds() function.
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// Warning, due to the way the Javascript parser works, applying functions on
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// numbers is kind of weird. See examples for details.
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//
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// Examples
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//
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// 2.seconds()
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// //=> SyntaxError: Unexpected token ILLEGAL
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//
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// 10..seconds()
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// //=> 10000
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//
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// (5).seconds()
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// //=> 5000
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// // This is the preferred way to represent numbers when calling these
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// // methods on them
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//
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// Returns an integer representing time in milliseconds
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/**
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* Multiplies a number by 1000 to get time in milliseconds
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*
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* @example
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* (2).seconds(); //=> 2000
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* @return {Number} time in milliseconds
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*/
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Number.prototype.seconds = function() {
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return this * 1000;
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};
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/**
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* Alias for Number.prototype.seconds
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*
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* @see Number.prototype.seconds
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* @example
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* (1).second(); //=> 1000
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* @return {Number} time in milliseconds
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*/
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Number.prototype.second = Number.prototype.seconds;
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/**
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* Converts a number from a current scale to a 0 - 1 scale.
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*
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* @param {Number} start low point of scale to convert from
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* @param {Number} end high point of scale to convert from
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* @example
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* (5).fromScale(0, 10) //=> 0.5
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* @return {Number} the scaled value
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*/
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Number.prototype.fromScale = function(start, end) {
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var val = (this - min(start, end)) / (max(start, end) - min(start, end));
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if (val > 1) {
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return 1;
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}
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if (val < 0){
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return 0;
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}
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return val;
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};
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/**
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* Converts a number from a 0 - 1 scale to the specified scale.
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*
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* @param {Number} start low point of scale to convert to
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* @param {Number} end high point of scale to convert to
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* @example
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* (0.5).toScale(0, 10) //=> 5
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* @return {Number} the scaled value
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*/
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Number.prototype.toScale = function(start, end) {
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var i = this * (max(start, end) - min(start, end)) + min(start, end);
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if (i < start) {
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return start;
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}
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if (i > end) {
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return end;
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}
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return i;
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};
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};
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