descend

v0.9.6

STATUS

Passing

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VISIBILITY

Public

PUBLISHED

5 years ago

SIZE

939 B

Makes a descending comparator function out of a function that returns a value that can be compared with `<` and `>`.

Function

Utils

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descend (

fn:Function,

a:*,

b:*

) : Number

Makes a descending comparator function out of a function that returns a value that can be compared with < and >.

Example

const byAge = R.descend(R.prop('age'));
     const people = [
       { name: 'Emma', age: 70 },
       { name: 'Peter', age: 78 },
       { name: 'Mikhail', age: 62 },
     ];
     const peopleByOldestFirst = R.sort(byAge, people);
       //=> [{ name: 'Peter', age: 78 }, { name: 'Emma', age: 70 }, { name: 'Mikhail', age: 62 }]

Arguments

fn: Function

A function of arity one that returns a value that can be compared

a: *

The first item to be compared.

b: *

The second item to be compared.

Returns

Number

`-1` if fn(a) > fn(b), `1` if fn(b) > fn(a), otherwise `0`