bind create a new function with the same function body

so, when we return the console.log as "foo", we call like this:

foo("hello", "world")
but you should remmeber, we pass a parameter 'namespace' to
console.log.bind(), so the argument will insert before the "hello" and
"world"
because we don't care about 'this', we just want to insert the parameter
before the function that bind returns, so we can change 'console' to
'undefined'