in which jnvm makes a fool of himself claiming: bind modifies function, doesn't return new one

samebind.js

var echo=function(){
  var echoes=echo.count||10
  while(echoes--) this.makeNoise()
}

var dog={
  sound:"woof",
  makeNoise:function(){ console.log(this.sound) },
}

echo.count=3
var barkAtGrandCanyon=echo.bind(dog)
barkAtGrandCanyon()//echoes 3x, since it's the same function. If it were a new function, it wouldn't have the count property.
                            //(^FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE^)
echo.count=20
barkAtGrandCanyon()//echoes 20x

Bind absolutely creates a new function.

It echoes 3x times because it references the count property on the old function on line 2.
Try adding these lines at the end, and you'll see:

console.log("echo.count", echo.count) // 20
console.log("barkAtGrandCanyon.count", barkAtGrandCanyon.count) // undefined

..agreed! I didn't actually construct a test of my claim! Bah. Thank you & very sorry.

It's even the first sentence in mdn:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind

The bind() method creates a new function