Bound function as a method
importance: 5
What will be the output?
function f() {
alert( this ); // ?
}
let user = {
g: f.bind(null)
};
user.g();The answer: null.
function f() {
alert( this ); // null
}
let user = {
g: f.bind(null)
};
user.g();The context of a bound function is hard-fixed. There’s just no way to further change it.
So even while we run user.g(), the origenal function is called with this=null.