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add arity example

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stoeffel 2015-02-23 12:51:39 +01:00
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@ -5,19 +5,29 @@
__Let's try and define these with examples, this is a WIP please feel free to send PR ;)__ __Let's try and define these with examples, this is a WIP please feel free to send PR ;)__
## Arity ## Arity
> The number of arguments a function takes.
```js
const sum = (a, b) => a + b;
const arity = sum.length;
console.log(arity);
// => 2
// The arity of sum is 2
```
## Purity
--- ---
## Purity ## Side effects
--- ---
## Side effects ## Idempotency
---
## Idempotency
--- ---