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

The 2018 ES6+ ANSWER IS:

    const arr = [1, 2, 3];

    arr.forEach((val, key, arr) => {
      if (Object.is(arr.length - 1, key)) {
        // execute last item logic
        console.log(`Last callback call at index ${key} with value ${val}` ); 
      }
    });