javascript forEach() method calls a function once for each element in an array , callback function is not executed for array elements without values.

JavaScript’s arrays can hold heterogeneous types ... rather than traditional imperative loops that describe in detail what is to occur. Let’s look at a few examples of working with arrays ...

If not specified the value defaults to undefined. If there are not enough elements in the array for the last iteration of the loop the remaining arguments to the callback will be undefined. Optionally ...