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An overridable equivalent for Function.prototype.bind


Once a function is bound, there's no way of un-binding it - i.e. to run it under a different context. So, this module is an equivalent to Function.prototype.bind, which still allows for the function context to be overridden with bind, call and apply.

$ npm install weak-bind

bind(fn, context, [args...]) is equivalent to fn.bind(context, [args...]), but reversible.

var bind = require('weak-bind')
  , first = { x: 'first' }
  , second = { x: 'second' }
function getX() {
  return this.x;
getX(); // NaN 
bind(getX, first)() // "first" 
getX.bind(first)()  // "first" 
bind(getX, first).bind(second)() // "second" 
getX.bind(first).bind(second)()  // "first"