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Boris Marinov 2016-03-25 11:31:04 +02:00
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@ -75,14 +75,14 @@ curriedSum(40)(2) // 42.
## Composition ## Composition
> A function which combines two values of a given type (usually also some kind of functions) to a third value of the same type. > A function which combines two values of a given type (usually also some kind of functions) into a third value of the same type.
The most straightforward type of composition, is called "normal function composition". The most straightforward type of composition is called "normal function composition".
It allows you to combines functions which accept and return a single value. It allows you to combines functions that accept and return a single value.
```js ```js
const compose = (f, g) => a => f(g(a)) // Definition const compose = (f, g) => a => f(g(a)) // Definition
const floorAndToString = compose((val)=> val.toString(), Math.floor)(222.44) //Usage const floorAndToString = compose((val)=> val.toString(), Math.floor) //Usage
floorAndToString(121.212121) // "121" floorAndToString(121.212121) // "121"
``` ```
@ -92,7 +92,7 @@ floorAndToString(121.212121) // "121"
## Purity ## Purity
> A function is said to be pure if the return value is only determined by its > A function is said to be pure if the return value is only determined by its
input values, without any side effects and mutations. input values, without any side effects.
```js ```js
let greet = "yo"; let greet = "yo";
@ -181,7 +181,7 @@ Points-free function definitions look just like normal assignments without `func
Object.freeze({name: 'John', age: 30}) // The `freeze` function enforces immutability. Object.freeze({name: 'John', age: 30}) // The `freeze` function enforces immutability.
(a) => a (a) => a
``` ```
Note that the value-containing structures defined below such as [Functor](#functor), [Monad](#monad) etc. are themselves values. This means, among other things, that they can be nested within each other. Note that value-containing structures such as [Functor](#functor), [Monad](#monad) etc. are themselves values. This means, among other things, that they can be nested within each other.
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