JS Calling Object Property by Variable

Question

When I have an object and I want to refer to a property within it, I can use e.g.

objectName.propertyName

and when I have a "subproperty" I can use

objectName.propertyName.propertyName

But how can I use a variable with this syntax ?

objectName.myvar.propertyName

Obviously this does not work. The variable is interpreted as a string itself and calls for the value with the key: "myvar".

How do I have to declare the variable using this syntax to be used like this:

var myvar = qwertz; objectName.myvar.propertyName

and be interpreted as

var myvar = qwertz; objectName.qwertz.propertyName

p.s.w.g · Accepted Answer · 2014-02-15 16:04:17Z

2

var myvar = 'qwertz';
var result = objectName[myvar].propertyName; 
// equivalent to objectName.qwertz.propertyName

answered Feb 15, 2014 at 16:04

p.s.w.g

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1 Comment

Thx I didnt remove the dot between objectName and [myvar] when i used the brackets