Node.js forEach

Node.js forEach is used to execute the provided function for each element.

Syntax - forEach

The syntax of forEach is;

let　arr　=　[element1,　element2,　elementN];　
arr.forEach(myFunction(element,　index,　array,　this){　function　body　});

The myFunction function executes element in arr. element is passed as a parameter to the function during each iteration, and the array is passed as a parameter to the function.

Example1：forEach on the element array

In this example, we will apply forEach to each element of the array.

let　array1　=　['a1',　'b1',　'c1'];　
array1.forEach(function(element)　{　
　　console.log(element);　
　});

Output Result

a1
b1
c1

Example2：forEach has an external function passed as a parameter on the element array

In this example, we will apply forEach to each element of the array. Then, we define the function separately and pass it as a parameter to forEach.

let　array1　=　['a1',　'b1',　'c1}　
let　myFunc　=　function(element)　{　
　　console.log(element)　
　}　
array1.forEach(myFunc)

Example3：Can access element, index, and array on the forEach of the array

In this example, we will access the index, array, and element in each iteration.

let　array1　=　['a1',　'b1',　'c1}　
　
let　myFunc　=　function(element,　index,　array)　{　
　　console.log(index　+　'　:　'　+　element　+　'　-　'　+　array[index])　
　}　
　
array1.forEach(myFunc)

Output Result

0　:　a1　-　a1
1　:　b1　-　b1
2　:　c1　-　c1