Introduction

While Loop is used to execute task multiple times until the specified condition is true

Flow Chart

Syntax:


while(condition){
	// code to be executed
}

Explanation :

In place of Condition, you will write the condition until the task should be executed

Now, Lets see some Examples :

Example

Print "Hello World" 20 times.


var i=1;
while(i<=10){
	console.log("Hello world");
	i++;
}

//output:
//Hello world
//Hello world
//Hello world
//Hello world
//Hello world
//Hello world
//Hello world
//Hello world
//Hello world
//Hello world

Here,

We have declared a variable i=1

Next, We have used a while statement with a condition i<=10 Thatmeans, until and unless the value of i becomes 10 the console.log("Hello world"); and i++ will be executed.

We have used i++ to increment the value of i by 1 i.e. i=i+1

Example

We will make a program that gives sum of first 10 natural numbers.


var sum = 0;
var numbers = 10;
var i=1;
while(i <= numbers) {
    sum += i;
		i++;
}
console.log(sum);

//output:
//55

Here,

We have declared variables sum=0 , number=0 and i=1 then we have used while loop to iterate i until its values becomes equal to numbers Every time value of i will Add to the Value of sum

Then, Value of sum is printed to the Console Tab.

Explanation:

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