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copied!<p>Matt's solution is pure genius - however there is some room for improvement:</p> <ul> <li>The solution fails if the 'path' has no separators; <code>set('h1', somevalue)</code> will fail because the splitting of the path fails in that case</li> <li>Only global scope is supported.</li> <li>If you have an object with <code>obj.here.is.a.value = "I am a value"</code> and you ask for <code>obj.here.is.a.value.no.value</code> - it will still return "I am a value"</li> </ul> <p>Here's my fix for these three issues:</p> <pre><code> getPropertyValueByPath : function(obj, path) { path = path.split(/[\[\]\.]+/); if(path[path.length - 1] == "") { path.pop(); }; while(path.length && ( obj = obj[path.shift()])); return obj; } setPropertyValuebyPath : function(obj, path, value) { var pathElements = path.replace(/\[|\]/g, '.').replace(/\.+/g, '.').split(/\./) pathEnd = pathElements[pathElements.length - 1] pathRoot = (pathElements.slice(0, pathElements.length - 1).join('.')) var currObj = obj for(var i = 0; i < pathElements.length; i++) { if( typeof (currObj[pathElements[i]]) == 'undefined') { currObj[pathElements[i]] = {} } currObj = currObj[pathElements[i]] } // This line by Matt is genious :) getPropertyValueByPath(obj, pathRoot)[pathEnd] = value return true } </code></pre> <p>call them like this:</p> <pre><code>var joe = {} setPropertyValueByPath(joe,'the[1].long.and[2].road', 'yeah') // joe.the[1].long.and[2].road now has a value of 'yeah' - // all the missing objects were created // this will alert 'yeah' alert( getPropertyValueByPath(joe,'the[1].long.and[2].road') ) </code></pre>

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