Checking whether obj.prop.innerprop.yetAnotherInnerProp is defined

Question

Is there any easy way to check whether a deeply nested object is defined? For example, can i do something like

typeof obj.prop.innerprop.yetAnotherInnerProp === 'undefined'

such that it should return true in case any of the inner objects are undefined.

In this case, we know for sure that obj is defined, but not sure whether prop, innerprop or yetAnotherInnerProp is defined. My function needs the value of yetAnotherInnerProp, but at runtime the root obj can have a structure that matches the one shown above, or it could have a different structure like obj.diffprop.diffinner. I want to check if yetAnotherInnerProp exists.

I know I could do something like,

if(obj.hasOwnProperty('prop')
  if(obj.prop.hasOwnProperty('innerprop')
    if(obj.prop.innerprop.hasOwnProperty('yetAnotherInnerProp')
     value = obj.prop.innerprop.yetAnotherInnerProp

But I wanted to know if there's an easier way to achieve this.

Nope. Different _methods_ of achieving, but must check each along the way. Otherwise will throw. — Randy Casburn, Apr 03 '18 at 19:13
Yeah I could use `try...catch` to achieve this too, but I was just wondering if there's an easier _shorthand_ way to do this.. — Chetan Jadhav CD, Apr 03 '18 at 19:15

Checking whether obj.prop.innerprop.yetAnotherInnerProp is defined

0 Answers0