---
zotero-key: TLUTFXJ8g5383243
zt-attachments:
  - "146"
citekey: jenkisWhatFunctionalProgramming2015
---
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> [!cite]+ [What Is Functional Programming?](zotero://select/groups/5383243/items/TLUTFXJ8) - [Page ](zotero://open-pdf/groups/5383243/items/8P4TX53J?annotation=S979DXY2)
> A function is called 'pure' if all its inputs are declared as
> inputs - none of them are hidden - and likewise all its outputs are
> declared as outputs.
> ^S979DXY2a8P4TX53Jg5383243

> [!cite]+ [What Is Functional Programming?](zotero://select/groups/5383243/items/TLUTFXJ8) - [Page ](zotero://open-pdf/groups/5383243/items/8P4TX53J?annotation=IU2KWY7L)
> Functional programming is about writing pure functions, about removing
> hidden inputs and outputs as far as we can, so that as much of our
> code as possible just describes a relationship between inputs and
> outputs.
> ^IU2KWY7La8P4TX53Jg5383243