Clean Code Practices Every Developer Should Know

Clean code is not about clever abstractions. It is about reducing the time it takes the next person — often you — to understand what a piece of code does and why.

Name things for what they are

A variable called data tells the reader nothing. unpaidInvoices tells them everything. Spend the extra seconds on a name; you will read it a hundred times.

Keep functions small and honest

A function should do one thing and its name should say what that thing is. If you need the word and to describe it, split it.

Let tests describe behaviour

Good tests read like documentation:

it('rejects a withdrawal that exceeds the balance', () => {
  const account = new Account(100);
  expect(() => account.withdraw(150)).toThrow(InsufficientFunds);
});

Comment the why, not the what

The code already says what happens. Comments earn their place when they explain a constraint, a trade-off or a surprising decision.

Leave it better than you found it

Rename one confusing variable, delete one dead branch, add one missing test. Small, consistent improvements compound faster than any big rewrite.