I avoid boolean function arguments. Here’s why.

🚩 They’re hard to read.
🚩 They infer the function does two different things

Here's two common examples, with solutions.

Example 1 - Hard to read:

Example 2 - Does two things:

In both cases, the code reads more clearly.

A third option I forgot to mention: accept an object.

savePurchase({emailReceipt: true});

Now the Boolean reads well.

Handy with optional args or multiple args too.

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