What is while loop
The while loop in JavaScript is a control flow statement that repeatedly executes a block of code as long as a specified condition is true. It’s useful when you don’t know in advance how many times the loop should run.
Syntax
while (condition) {
// Code to execute as long as the condition is true
}
Example
let count = 0;
while (count < 5) {
console.log("Count is: " + count);
count++; // Increment the count to avoid an infinite loop
}
Explanation:
The loop starts with count = 0.
It checks the condition count < 5. If true, it executes the code inside the loop.
The count variable is incremented by 1 each time the loop runs.
Once count reaches 5, the condition becomes false, and the loop stop.
What is do-while loop?
The do-while loop in JavaScript is a control flow statement that executes a block of code at least once, and then repeatedly executes the block as long as a specified condition is true. It differs from the while loop because the condition is checked after the code block is executed, ensuring the block runs at least once.
do: Contains the block of code to execute.
while: Contains the condition that determines if the loop will run again.
Syntax
do {
// Code to execute
} while (condition);
Example
let count = 0;
do {
console.log("Count is: " + count);
count++;
} while (count < 5);
Explanation:
The do block executes once with count = 0.
After the first execution, the while condition count < 5 is checked.
As long as the condition is true, the loop continues.
Once count reaches 5, the condition becomes false, and the loop stops.
