KISS: Keep It Simple Stupid

It states that a design should be kept as simple as possible. Complexity should only be introduced when absolutely necessary.

Importance

• Easier Debugging
• Improved Readability
• Better Maintainability
• Faster Development

Example

Bad Code

import java.util.*;
public class NumberUtils {
    public static boolean isEven(int number){
        // Using unncessary logic
        boolean isEven = false;
        if(number % 2 == 0){
            isEven = true;
        } else {
            isEven = false;
        }
        return isEven;
    }
}

In the above code, we have a lot of extra variables, unnecessary if-else logic and hence makes it longer and hard to follow

Refactored Good Code

import java.util.*;
public class NumberUtils {
    public static boolean isEven(int number){
        return number %2 === 0;
    }
}

In refactored code, we gave a one liner solution, easy to understand and follows KISS principle by avoiding overengineering.