JS — exit the function — return

함수빠져나오기

The return statement ends function execution

let countTo = function(num){
  if(typeof num != 'number') return false;
  for(var i = 1; i <= num; i++){
    console.log(i);
  }
}
//countTo(9) // number
//console.log(countTo('9')) //string - false

• examine other’s code

function revealImage(element) {
  
  // If the watcher isn't in the viewport exit the function
  if(!this.isInViewport) {
    return;
  }
....
}

#reference

JavaScript: What is the return statement?

#add 13.09.2018

if(!audio) return; // if other keys are down, exits this function.
console.log(audio)
audio.play();