The constant function from functional programming: it takes a value and returns a function that will return that value:
npm install constThe constant function from functional programming: it takes a value and returns a function that will return that value:
``javascript
var constant = require('const')
var alwaysA = constant('a');
alwaysA() //= 'a'
`
Useful to lifting a value into the world of functions, e.g. when using promises:
`javascript``
getUserDetails()
.then(getMessageFromUser, constant('User not found'))
Other names it's gone by in the past:
* K combinator
* lift
* always