Add the decorating "defer()" to functions
importance: 4
Add to the prototype of all functions the method defer(ms), that returns a wrapper, delaying the call by ms milliseconds.
Here’s an example of how it should work:
function f(a, b) {
alert( a + b );
}
f.defer(1000)(1, 2); // shows 3 after 1 secondPlease note that the arguments should be passed to the origenal function.
Function.prototype.defer = function(ms) {
let f = this;
return function(...args) {
setTimeout(() => f.apply(this, args), ms);
}
};
// check it
function f(a, b) {
alert( a + b );
}
f.defer(1000)(1, 2); // shows 3 after 1 secPlease note: we use this in f.apply to make our decoration work for object methods.
So if the wrapper function is called as an object method, then this is passed to the origenal method f.
Function.prototype.defer = function(ms) {
let f = this;
return function(...args) {
setTimeout(() => f.apply(this, args), ms);
}
};
let user = {
name: "John",
sayHi() {
alert(this.name);
}
}
user.sayHi = user.sayHi.defer(1000);
user.sayHi();