catch forEach last iteration

Question

arr = [1,2,3];
arr.forEach(function(i){
// last iteration
});

How to catch when the loop ending? I can do if(i == 3) but I might don\'t kn

Answer 1

Updated answer for ES6+ is here.

---

arr = [1, 2, 3]; 

arr.forEach(function(i, idx, array){
   if (idx === array.length - 1){ 
       console.log("Last callback call at index " + idx + " with value " + i ); 
   }
});

would output:

Last callback call at index 2 with value 3

The way this works is testing arr.length against the current index of the array, passed to the callback function.