JavaScript OR (||) variable assignment explanation

Question

Given this snippet of JavaScript...

var a;
var b = null;
var c = undefined;
var d = 4;
var e = \'five\';

var f = a || b || c || d || e;

alert(f); // 4
         


        

Answer 1

Return output first true value.

If all are false return last false value.

Example:-

  null || undefined || false || 0 || 'apple'  // Return apple