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

Answer 1

Use the bracket notation:

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