docs-v2/content/v2.0/reference/flux/language/side-effects.md

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Side effects A summary of side effects in the Flux functional data scripting language.
v2_0_ref
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Flux specification Side effects
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Side effects can occur in one of two ways.

  1. By reassigning built-in options
  2. By calling a function that produces side effects

A function produces side effects when it is explicitly declared to have side effects or when it calls a function that itself produces side effects.