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The constant function from functional programming: it takes a value and returns a function that will return that value:

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:

    .then(getMessageFromUser, constant('User not found'))

Other names it's gone by in the past:

  • K combinator
  • lift
  • always