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When it comes to writing clean, reusable code in JavaScript, function composition can be an extremely useful technique. But what exactly is function composition? How does it work and why is it helpful? In this article, we’ll break down the concept of function composition in JavaScript with simple real-world examples to help you simplify your code.
The Power of LEGO-Like Code Building Blocks
In its simplest form, function composition is about treating functions like LEGO blocks — small, modular pieces that you can snap together to build larger structures.
Just as combining LEGO blocks allows you to create complex builds out of simple building blocks, composing multiple JavaScript functions together allows you to create larger, more complex logic out of simple pieces.
The result is code that reads cleanly from top-to-bottom, almost like a recipe. You take some ingredients (input values), run them through a series of small steps (functions), and end up with an output.
Let’s look at some examples to see it applied in JavaScript:
