I was looking for a short, simple way to set and get deep properties in a single line in javascript, and after not finding anything I decided to see how short I could make these methods. Enjoy.

deepProperties.js

// Set deep property
function setProperty(p,v){p=p.split('.'),i=0,w=("string"===typeof v?'"'+v+'"':v);while(p[i])eval(p.slice(0,++i).join('.')+'='+(p[i]?"{}":w));return v}
// Example
setProperty('some.really.deep.property', 'now exists'); // "now exists"

// Get deep property
function getProperty(p){p=p.split('.'),v=this;while(p[0]&&v){v=v[p.shift()]}return v}
// Example
getProperty('some.really.deep.property'); // "now exists"

So today, I wrote a one-line deep property setter/getter.

function(p,v){p=p.split('.'),v=(v?(function(){i=0,w=("string"===typeof v?'"'+v+'"':v);while(p[i])eval(p.slice(0,++i).join('.')+'='+(p[i]?"{}":w));return v})():(function(){v=this;while(p[0]&&v)v=v[p.shift()];return v})());return v}

Here is the readable version.

function deepProperty(p,v){
    p=p.split('.'),
    v=(v?(function(){
        i=0,
        w=("string"===typeof v?'"'+v+'"':v);
        while(p[i])eval(p.slice(0,++i).join('.')+'='+(p[i]?"{}":w));
        return v
    })():(function(){
        v=this;
        while(p[0]&&v)
            v=v[p.shift()];
        return v
    })());
    return v
}

You've inspired me: https://gist.github.com/lukeburns/6954291

You both inspired me: https://gist.github.com/kr1zmo/6958301