forEach

Describing the forEach Operation

• The forEach method is used for looping over an array

• It accepts a callback function with the following arguments:

  • currentValue: Current element processed in the array
  • index: Optional index of currentValue
  • array: Optional array that is called
  • thisArg: Optional value to use as this

Defining an Array

let fruits = ['Apple', 'Banana'];
console.log(fruits.length);
// 2

Using the forEach Operation

// Regular function
fruits.forEach(function(item, index, array) {
    console.log(item, index);
})
// Apple 0
// Banana 1

// Arrow function
fruits.forEach(item => console.log(item));
// Apple
// Banana