A simple JSON stringify function which requires Array.prototype.map method.
The following users provided lots of ideas and improvements of the code.
@Kambfhase, @hartrock, @atk, @haochi, @jed
Actually, I just provided a deficient version at first. The other versions were created by these users(especially @atk). You may see the discussion below.
| function f( | |
| a, // input (expect object) | |
| b, // placeholder | |
| c // placeholder | |
| ){ | |
| for (b in | |
| // if the input is an object, assign an empty array to c and loop through the properties of it; | |
| // otherwise assign false to c and iterate over nothing. | |
| // but since it's just a roughly checking, a string "[object Object]" will falsely be identified as object, | |
| // and starts the iteration in most of the browsers - | |
| // as properties on strings can be accessed like arrays(except lower IE version, e.g. IE7). | |
| // (reference: http://kangax.github.com/es5-compat-table/#property-access-on-strings). | |
| // anyway, the function still works although there may be unwanted loopings with a bit slower. | |
| (c = a == '' + {} && []) && a | |
| ) | |
| // fill array with object-style key: value pairs, call ourself recursively to escape keys and values. | |
| c.push(f(b) + ':' + f(a[b])); | |
| // check if the input is a string, | |
| return '' + a === a ? | |
| // output as a string literal; | |
| '"' + a + '"' : | |
| // otherwise check if the input is present and an array (has .map), | |
| a && a.map ? | |
| // output as an array literal; | |
| '[' + a.map(f) + ']' : | |
| // otherwise check if the input is an object (c is an array rather than false), | |
| c ? | |
| // output as an object literal; | |
| '{' + c + '}' : | |
| // otherwise use plain coercion (mostly for number/boolean/null literals). | |
| a | |
| } |
| function f(a,b,c){for(b in(c=a==""+{}&&[])&&a)c.push(f(b)+":"+f(a[b]));return""+a===a?'"'+a+'"':a&&a.map?"["+a.map(f)+"]":c?"{"+c+"}":a} |
| DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE | |
| Version 2, December 2004 | |
| Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE> | |
| 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": "JSON stringify", | |
| "description": "A JSON stringify function", | |
| "keywords": [ | |
| "JSON", | |
| "stringify" | |
| ] | |
| } |
| <!DOCTYPE html> | |
| <title>JSON stringify</title> | |
| <div>Expected value: <b>{"a":123,"b":true,"c":false,"d":null,"e":{"a":"some text"},"f":[1,2,3],"g":["eins","zwei","drei"],"h":[{"one":1},{"one":1,"two":2}],"i":[{"one":1},{"one":1,"two":[{"three":3},[1,2,3]]}]}</b></div> | |
| <div>Actual value: <b id="ret"></b></div> | |
| <script> | |
| var myFunction = function f(a,b,c){for(b in(c=a==""+{}&&[])&&a)c.push(f(b)+":"+f(a[b]));return""+a===a?'"'+a+'"':a&&a.map?"["+a.map(f)+"]":c?"{"+c+"}":a}; | |
| document.getElementById( "ret" ).innerHTML = myFunction({ | |
| a: 123, | |
| b: true, | |
| c: false, | |
| d: null, | |
| e: {a: "some text"}, | |
| f: [1, 2, 3], | |
| g: ["eins", "zwei", "drei"], | |
| h: [{one:1}, {"one":1, two:2}], | |
| i: [{one:1}, { "one":1, two:[ {three:3}, [1,2,3] ] } ] | |
| }) | |
| </script> |
@adius: doesn't help, because we'll need a.map anyway. A working version (alas, with 214bytes too long) is here:
function s(a,b,c){for(b in(c=a==''+{}&&[])&&a)c.push(s(b)+':'+s(a[b]));return''+a===a?'"'+a.replace(/[\x00-\x32\\]/g,function(x){return'\x'+x.charCodeAt().toString(16)})+'"':a&&a.map?'['+a.map(s)+']':c?'{'+c+'}':a}I've not yet tested if it still works if you replace
function(x){return'\x'+x.charCodeAt().toString(16)}withfunction(x){return escape(x).replace(/%/g,'\\x')}, saving 2 further bytes.