Does forEach() bind by reference?

Question

var arr = [\'Foo\'];

arr.forEach(function(item){
  console.log(item);
  item = \'Lorem\';
  console.dir(arr[0]);

});

for (var item in arr){
  arr[item] = \'Ipsum\         


        

Answer 1

In your case, the item variable is passed by value, because it is of a primitive value. If it were a json object, and you would change one of its properties, it would be reflected on the original list.

In this situation, you can use other arguments that the forEach has. For example:

arr.forEach(element, index, array) {
    ...
}

Using these arguments, you can affect directly array[index]