Composition Is the Superpower

The quiet power of functions is composition — feeding the output of one function into another. Write g(f(x)) and you have chained two machines. Almost every app is composition in action: text input → autocorrect → spell-check → display. Each step transforms the data and hands it to the next.

This is why some programming languages treat functions as first-class values. The React framework builds interfaces by composing small component functions. Once you see composition, you stop seeing code as lines and start seeing a pipeline.