Keep It Simple Stupid!

SimplifyCo — Wed, 11 Mar 2026 21:40:41 +0000

Keep It Simple

In software development, code often becomes more complex than necessary, making maintenance and updates harder. The “KISS” principle helps reduce problems to their core and avoid unnecessary complexity.

This principle applies on multiple levels: from individual functions to entire applications.

The Principle at an Abstract Level

At a high level, it means that a program or tool should do one thing and do it well. Linux provides a great example: many small programs each handle a single task. Combining them allows for solving more complex problems efficiently.

Example: Find all running „ssh“ processes

ps aux | grep ssh
user 38351 0.0 9552  2436 pts/2 S+ 22:23 0:00 grep --color=auto ssh

Analysis

Each program does a simple job. ps prints the processes, while grep can be used to search content. Combined with a pipe, you can search the processes.

The Principle at the Implementation Level

Even simple tasks can be implemented in multiple ways. Let’s look at checking whether a value exists in a list of numbers in C++.

Variant 1 – Basic `for` loop


bool contains(const std::vector<int>& v, int target) {
    for (size_t i = 0; i < v.size(); i++) {
        if (v[i] == target) {
            return true;
        }
    }
    return false;
}

Variant 2 - Using library function


bool contains(const std::vector<int>& v, int target) {
    return std::find(v.begin(), v.end(), target) != v.end();
}

Analysis

Variant 1 is explicit and maybe easier to understand for someone, who is new to the language; you can follow the loop step by step.
Variant 2 is more concise, leveraging the STL library; experienced readers instantly understand the logic.

Which variant do you like more? Let me know in the comments.

The core principle remains: write code focused on the task, avoiding unnecessary complexity.

Why Simple Code Matters

Code is read far more often than it is written. Maintaining or extending a program requires understanding it first. Simple code is easier to maintain for yourself and for others.

Comments help, but ideally, code should be self-explanatory.

Writing Simple Code is Hard

Many developers mistakenly think simple code reflects a lack of skill. But it requires consciously removing unnecessary complexity. Experienced programmers often try to show off clever solutions, which can make code harder to understand.

The guiding rule: Each piece of code should do one thing.

At the function level: a method should have a single responsibility.
At the application level: software should serve one clear purpose.

Conclusion

Simplicity is not a lack of skill, it’s a sign of maintainable, professional software development. Keeping code simple saves time, reduces bugs, and improves collaboration.

Tip: With each new function or feature, ask: “Am I making this as simple as possible?” and remove anything unnecessary.

DEV Community: SimplifyCo

Keep It Simple Stupid!

Keep It Simple

The Principle at an Abstract Level

Example: Find all running „ssh“ processes

Analysis

The Principle at the Implementation Level

Variant 1 – Basic for loop

Variant 2 - Using library function

Analysis

Why Simple Code Matters

Writing Simple Code is Hard

Conclusion

Variant 1 – Basic `for` loop