JavaScript For Loop - GeeksforGeeks

JavaScript for loop is a control flow statement that allows code to be executed repeatedly based on a condition. It consists of three parts: initialization, condition, and increment/decrement.

Syntax

for (statement 1 ; statement 2 ; statement 3){    code here...}

Statement 1: It is the initialization of the counter. It is executed once before the execution of the code block.
Statement 2: It defines the testing condition for executing the code block
Statement 3: It is the increment or decrement of the counter & executed (every time) after the code block has been executed.

Now let's understand this with the help of an example

javascript

// for loop begins when x=2
// and runs till x <= 4
for (let x = 2; x <= 4; x++) {
    console.log("Value of x:" + x);
}

Output

Value of x:2
Value of x:3
Value of x:4

For loop to print table of a number.

JavaScript

let x = 5
for (let i = 1; i <= 10; i++) {
  console.log(x * i); 
}

Output

For loop to print elements of an array.

JavaScript

let arr = [10, 20, 30, 40];
for (let i = 0; i < arr.length; i++) {
  console.log(arr[i]); 
}

Output

Flow chart

This flowchart shows the working of the for loop in JavaScript. You can see the control flow in the For loop.