I managed to condense my 7 years old javascript random code for the 140byt.es contest.
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Then you must know the answer to this question http://stackoverflow.com/questions/11798903/javascript-casts-floating-point-numbers-to-integers-without-cause
| function getRandom(a, b) { | |
| // arguments.length is zero, if a and b are falsy | |
| return !a && !b | |
| ? | |
| // we return the result of a default Math.random() call | |
| // and save the result in case we need is later | |
| r = Math.random() | |
| : | |
| ( | |
| // wrapped the code in a function for | |
| // byte saving via arguments shortcuts | |
| function(r, a, b) { | |
| // we only deal with int | |
| // it's impossible *g* to detect that 1.0 is a float in javascript | |
| // see my post http://stackoverflow.com/questions/11798903/javascript-casts-floating-point-numbers-to-integers-without-cause | |
| return parseInt( | |
| // shortcut for one argument | |
| !b | |
| ? | |
| // we deal with one argument - max value | |
| r * (a + (a < 0 ? -1 : 1)) | |
| : | |
| // two arguments - min and max value | |
| a + (r * (b - a + 1)) | |
| ) | |
| } | |
| ) | |
| // r = placeholder for the result of Math.random() see obove | |
| // a = function argument one | |
| // b = function argument two or zero | |
| (r, a, b || 0) | |
| } |
| function(a,b){return !a&&!b?r=Math.random():(function(r,a,b){return parseInt(!b?r*(a+(a<0?-1:1)):a+(r*(b-a+1)))})(r,a,b||0)} |
| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| Version 2, December 2004 | |
| Copyright (C) 2013 Naden Badalgogtapeh <http://www.naden.de> | |
| Everyone is permitted to copy and distribute verbatim or modified | |
| copies of this license document, and changing it is allowed as long | |
| as the name is changed. | |
| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION | |
| 0. You just DO WHAT THE FUCK YOU WANT TO. |
| { | |
| "name": "getRandom", | |
| "description": "Generate random numbers in a given range.", | |
| "keywords": [ | |
| "number", | |
| "math", | |
| "random", | |
| "140bytes", | |
| "fjavascript" | |
| ] | |
| } |
| <!DOCTYPE html> | |
| <title>Foo</title> | |
| <div>Expected value: <b>undefined</b></div> | |
| <div>Actual value: <b id="ret"></b></div> | |
| <script> | |
| // write a small example that shows off the API for your example | |
| // and tests it in one fell swoop. | |
| var myFunction = function(a,b){return !a&&!b?r=Math.random():(function(r,a,b){return parseInt(!b?r*(a+(a<0?-1:1)):a+(r*(b-a+1)))})(r,a,b||0)} | |
| var ret = document.getElementById( "ret" ); | |
| ret.innerHTML = myFunction(); | |
| ret.innerHTML += '<br>' + myFunction(1); | |
| ret.innerHTML += '<br>' + myFunction(-1); | |
| ret.innerHTML += '<br>' + myFunction(7); | |
| ret.innerHTML += '<br>' + myFunction(-7); | |
| ret.innerHTML += '<br>' + myFunction(2, 4); | |
| ret.innerHTML += '<br>' + myFunction(-1, 1); | |
| </script> |