Set property name of object with var

[JimmyP]

This is probably really easy but I cannot figure out how to do it:

var newObject = {
    'hello': 'boo' // this is what I want
};
 
// The word, "hello" will not always be the same, so I'll set it in a variable:
 
var x = 'hello2';
 
// New object with "x" -
 
var newObject2 = {
    x: 'boo' 
};
 
// ^ the above (newObject2) sets property x as "boo" (i.e. newObject.x==='boo')
// I want there to be a "hello2" property (i.e. newObject2.hello2)
// How can I make this happen??

Any help appreciated...

[JimmyP]

Nevermind, I was being stupid...

//Easy:
var newObject = {};
newObject[x] = 'boo';