home

fp-light-call

npm i @sullux/fp-light-call source test

The purpose of the call helper is to allow the function to be passed as the most significant argument.

• call

call

call(arg: any, fn: <T>(mixed) => T): T

The call helper can be useful in functional composition. Consider the following example.

const { call } = require('@sullux/fp-light-call')
const { get } = require('@sullux/fp-light-get')

const random0To31 = () =>
  Math.floor(Math.random() * 36)

const randomString = length =>
  Array(length)
    .fill()
    .map(random0To31)
    .map(get('toString'))
    .map(call(36))
    .join('')

Note that since the call utility accepts an argument first and a function second, the .map(call(36)) sets up the call toString(36) for each input value. This isn't the most efficient example, but it is fully functional and serves as an example of passing a function as the most significant argument to the call utility.