JavaScript while loop Program
While statement
create a loop ()is executed while a condition is true .
while loop run the condition is the true.
In
JavaScript, a while loop is used to carry out repetitive operations by running
a block of code repeatedly as long as a given condition is met.
The code inside
the loop is run once the loop has evaluated the condition and found that it is
true.
The condition is verified once again following each execution of the
loop's code block.
The loop continues in this manner until the condition
evaluates to false, at which time it breaks and the code that comes after the
loop executes.
Syntax :-
while (condition check)
{
code executed
}
Code Explain :-
ஃ While loop use the codition inside ( ).
ஃ while loop condition TRUE then code { } executed.
ஃ while loop code evaluate again.
ஃ This condition FALSE then loop terminates.
FlowChart
while loop Example
Q. Display Number of 1 to 15
let num =1;
while (num <=15)
{
console.log(num);
num++;
}
Explain :-
num initialized to 1
while loop continues
count is less than equal(num<=15)
console.log(num)
After num ++ increment value 1 each iteration.
Output :-
Q. Display Number from 1 to 4
let x=1;
while(x<5)
{
console.log(x);
x+=1;
}
Explain :-
initialized variable 1
while loop continues count less (x<5)
console.log(x)
x is increment by 1
Output :-
3]while loop Example
count number in while loop
let count_number=1;
while(count_number<5)
{
console.log(count_number);
count_number++;
}
1] let count_number = 1
2] count_number<5 loop runs while loop.
3] less than 5 count_number = 1
4] console,log(count_number = 1 )
5] print current value and count_number ++ increment value by 1 each time.
6] count_number reaches 5 value the condition false
7] than loop exits
Output :-
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