cheap way to do a conditional in javascript. If the first part returns a falsy value, the second part doesn't execute

cheap-conditional.js

(function(){
  o = {}
  o.a = 1

  o.a == 1 && console.log("o is one:", o.a)
  o.a == 2 && console.log("false, this won't run")
  o.b && console.log("undefined is falsy, this wont run")
  
  //it's a little nicer than wrapping if{ } statements:
  if(o.a == 1) { console.log("o is one:", o.a) }
})()