comparator

v0.9.6

STATUS

Passing

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VISIBILITY

Public

PUBLISHED

5 years ago

SIZE

705 B

Makes a comparator function out of a function that reports whether the first element is less than the second.

Function

Utils

1 contributor

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comparator (

pred:Function

) : Function

Makes a comparator function out of a function that reports whether the first element is less than the second.

Example

const byAge = R.comparator((a, b) => a.age < b.age);
     const people = [
       { name: 'Emma', age: 70 },
       { name: 'Peter', age: 78 },
       { name: 'Mikhail', age: 62 },
     ];
     const peopleByIncreasingAge = R.sort(byAge, people);
       //=> [{ name: 'Mikhail', age: 62 },{ name: 'Emma', age: 70 }, { name: 'Peter', age: 78 }]

Argument

pred: Function

A predicate function of arity two which will return true if the first argument is less than the second, false otherwise

Returns

Function

A Function :: a -> b -> Int that returns `-1` if a < b, `1` if b < a, otherwise `0`