The **`forEach` method** in Javascript iterates over the elements of an array and calls the provided function for each element in order.

>**Note:** `forEach` only works on *arrays*. It does not execute a function for an *array* without any elements.

# Syntax  

It is written in the following form:

# Description

* **array**: the array on which the specified function is called.
* **forEach**: the method called for the *array* with the required parameters.

* **function(currentValue, index, arr)**: the function with its parameters which is required to run for each element of the *array*.

  * **currentValue**: the value of the current element.
  
  * **index**: the index of the current element being processed.
  * **arr**: the array object on which function was called.

* **thisValue**: value to be used as the function’s `this` value when executing it. "undefined" is passed if this value is not provided.

>**Note:** *index*, *arr* and *thisValue* are all optional parameters.

# Example

Here's an example implementing `forEach` in Javascript:

var arr = ['Wall-E', 'Up', 'Coco'];

arr.forEach(function(item) {
  console.log(item);
})

# Explanation

In the code above, the `forEach()` method calls the provided *function* for each element of `arr` in order. `item` is used to store the current value and as a result,  all the elements of the array are displayed on to the console one by one.


No optional parameters have been passed in this case. The code below uses optional parameters.

var arr = [5,4,8,7];

arr.forEach(function(item,index,arr) {
  console.log("item: " + item + " at index: " + index + " in the array: " + arr);
})

How to execute forEach in Javascript

The forEach method in Javascript iterates over array elements, calling a specified function for each element. Optional parameters include index and thisValue.