Why While and do-while loops in Kotlin? - Purpose & Use Cases

The Big Idea

What if you could make your program do boring tasks for you, perfectly every time?

The Scenario

Imagine you want to count how many times you can eat a cookie until the jar is empty. Doing this by writing each step down manually would be tiring and boring.

The Problem

Writing each step one by one takes too long and you might forget to stop at the right time. It's easy to make mistakes and hard to change the count if you want to try again.

The Solution

While and do-while loops let you repeat actions automatically until a condition is met. This saves time and avoids mistakes by handling the counting for you.

Before vs After

✗ Before

var count = 0
count = count + 1
count = count + 1
count = count + 1

✓ After

var count = 0
while (count < 3) {
    count++
}

What It Enables

You can repeat tasks easily and safely, making your programs smarter and more flexible.

Real Life Example

Using a loop to ask a user for a password until they get it right, instead of writing the same question many times.

Key Takeaways

Loops repeat actions automatically based on conditions.

While loops check the condition before running the code.

Do-while loops run the code once before checking the condition.