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Expand Up @@ -71,6 +71,7 @@ Side effects may include, but are not limited to
* obtaining user input
* querying the DOM
* accessing system state
* change browser URL

And the list goes on and on. Any interaction with the world outside of a function is a side effect, which is a fact that may prompt you to suspect the practicality of programming without them. The philosophy of functional programming postulates that side effects are a primary cause of incorrect behavior.

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