Hooks Tips Ep. 1 - The Dependency Array

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This blog post is the first in what I expect to be a series on hooks, this blog post assumes you have a decent initial understanding of them. I highly suggest starting with the ReactJS Docs on them first.

Some of the built-in hooks from the React package expose a second argument which acts as an indicator or signal to React to determine if the function provided as the first argument to the hook should be invoked again.

In this post I will only reference useEffect, however there are several hooks which follow this pattern:

• useMemo
• useCallback

In general, the notes below will apply to these other hooks as well.

I have also ordered the examples below based off of how frequently they will most likely be used, the first being the most frequent example and the last being the least frequently used.

Passing Dependencies:

function App() {
  const [count, setCount