Javascript Array forEach()

forEach() Syntax

The syntax of the forEach() method is:

arr.forEach(callback(currentValue), thisArg)

Here, arr is an array.

forEach() Parameters

The forEach() method takes in:

• callback - The function to execute on every array element. It takes in:
  • currentValue - The current element being passed from the array.
• thisArg (optional) - Value to use as this when executing callback. By default, it is undefined.

forEach() Return Value

• Returns undefined.

Example 1: Printing Contents of Array

Output

Array Element 0: 1800
Array Element 1: 2000
Array Element 2: 3000
Array Element 4: 5000
Array Element 5: 500
Array Element 6: 8000

Example 2: Using thisArg

Output

4
58
1440

Here, we can again see that forEach skips the empty element. thisArg is passed as this inside the definition of the execute method of the Counter object.

Recommended Reading: JavaScript Array map()