What is the name for the class of functions designed to be bound dynamically when called?

question.md

ES7 function bind syntax will add the :: operator for working with these kind of functions:

/* ES7 */
import { map, takeWhile, forEach } from "iterlib";

getPlayers()
::map(x => x.character())
::takeWhile(x => x.strength > 100)
::forEach(x => console.log(x));

These are being referred to as virtual methods, which seems like a misnomer when considering the oop definition.

Is there a proper name?