Better way to test for existence of a nested property in an object [duplicate]

Question

I'm working with javascript objects that have nested properties I need to test for, like

myObject = { 'some' : { 'nested' : { 'property' : { 'foo' : 'bar' } } } ... }

The trouble is myObject.some might not exist, nor myObject.some.nested, and so on. So to test for the existence of myObject.some.nested.property.foo I have to do this:

if (myObject.some) { if (myObject.some.nested) { if (myObject.some.nested.property) { if (myObject.some.nested.property.foo) { // do something with myObject.some.nested.property.foo here } } } }

because if I do if (myObject.some.nested.property.foo) and one of the parent properties doesn't exist, it throws the error:

TypeError: 'undefined' is not an object (evaluating 'myObject.some.nested.property.foo')

Is there a better way to test for nested properties without using so many if statements?

There are plenty of other dupes such as stackoverflow.com/questions/4343028/… or stackoverflow.com/questions/6927242/… — epascarello
– epascarello, Commented May 5, 2014 at 19:56

Johan · Accepted Answer · 2014-05-05 19:58:46Z

Navigate safely to it. foo will evaluate to false in case you don't get all the way.

var foo = myObject.some && myObject.some.nested && myObject.some.nested.property; if(foo) //use foo

http://jsfiddle.net/Y7LFp/

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