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Purity.

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Hemanth.HM 2015-04-03 03:57:05 +00:00
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@ -64,7 +64,16 @@ curriedSum(40)(2) // 42.
--- ---
## Purity ## Purity
> A function is said to be pure if the return value is only determined by its
input values, without any side effects.
```js
let greet = "yo";
greet.toUpperCase(); // YO;
greet // yo;
```
--- ---
## Side effects ## Side effects
@ -77,7 +86,7 @@ executions with the the same input parameters.
`f(f(x)) = f(x)` `f(f(x)) = f(x)`
`Math.abs(Math.abs(10))` `Math.abs(Math.abs(10))`
--- ---