simulate JS native call and bind

simulate-bind.js

Function.prototype.call = function (context, ...args) {
  context = context === undefine || context === null ? window : Object(context)
  const fn = Symbol('fn')
  context[fn] = this
  const result = context[fun](...args)
  delect context[fn]
  return result
}

Function.prototype.apply = function (context, args = []) {
  return this.call(context, ...args) 
}


Function.prototype.bind = function (context, ...bindArgs) {
  return (...args) => this.call(context, ...bindArgs, ...args)
}