let myObj = {
  str: 'Original Scope',
  foo: function() { 
	console.log(`my scope is ${this.str}.`);
  }
}

function myBind(func, scope){
	for(let prop in scope){
		this[prop] = scope[prop];
	}
	
	this.funcToCall = func;
	
	return this.funcToCall;
	
}

myObj.foo();
var newFoo = myBind(myObj.foo, {str: 'Overwridden Scope'});
newFoo();