javascript - use populated array

Question

Is there a one-liner code where I can say the assigning of a variable is to a populated array from a choice of 2 array?

For example:

I'd like:

var myArray = ['a','b','c'];

The choice is between 2 arrays.

var a = [];
var b = ['a','b','c'];

So basically if var a is populated, I'd like myArray to = a. If var a is not populated but var b is populated, myArray = b; if var a and b are empty, then myArray = [];

I've tried the following to no avail:

var myArray = a || b || [];

• zerkms: A conditional operator? a.length > 0 ? a : b?

Answer 1

var myArray = (a.length) ? a : b;

• zerkms: @JasonAller It would be a good homework for OP though. But no reason to check actually
• SeanCannon: no need. b acts as a failover to a and also as the empty double failover.
• zerkms: actually "it depends". Semantics of a || b || [] pseudo code and your statement are different
• KingKongFrog: ahhh, i like the double failover..didnt think of just assigning regardless. Thanks