Immediately invoked setInterval

Immediately_invoked_setInterval.js

/* Instead of
interval();
setInterval(interval, 1000);
*/
 
// -1. Invocation function already defined.
// Never use this even if it looks awesome implicit eval is slow because of an additional parse step.
function interval(){
  console.log("Invoked");
}
setInterval("interval()", 1000);

// 1. Invocation function already defined.
function interval(){
  console.log("Invoked");
}
setInterval((interval() || interval), 1000); //as setInterval fn's are not mearnt to return. interval() always evaluates to undefined.
 
// 2. Invocation function declared there itself.
setInterval((function interval() {
  console.log("Invoked");
  return interval;
})(), 1000);