I don't get Function.apply

[ghost]

How can I shorten this;

		process.nextTick = (f, ...args) => {
			if (args.length == 1) {
				uWS.nextTick(() => {f(args[0]);});
			}

			if (args.length == 2) {
				uWS.nextTick(() => {f(args[0], args[1]);});
			}

			if (args.length == 3) {
				uWS.nextTick(() => {f(args[0], args[1], args[2]);});
			}

			if (args.length == 4) {
				uWS.nextTick(() => {f(args[0], args[1], args[2], args[3]);});
			}
		}

So that it works, presumably with apply, bind or any such thing. I can't get it working with apply.

[frank-dspeed]

process.nextTick = (f, ...args) => {
  uWS.nextTick(() => f(...args));
}

the speard works also with arrays thats why this gets (arg1,arg2,arg3)
i am glad that i could help i saw your rant about NPM and i want to tell you your right it was the right way to do it i am a big fan of it !!!!! 💃

[frank-dspeed]

but you got that already in your code apply would look like

process.nextTick = (f, ...args) => {
  console.log(this instanceof global) //=> true!
  uWS.nextTick(() => f.apply(this, args));
} // this is in this case most time the global object  of nodejs or in case of browser window

function withName() {
  console.log(this instanceof global) //=> true!
  uWS.nextTick(() => f.apply(this, args));
}.bind(this)


function withName() {
  console.log(this instanceof global) //=> false!
  console.log(this instanceof withName) //=> true!
  uWS.nextTick(() => f.apply(this, args));
}

in a JS file directly used bind(this) is eqal to not using bind(this) as arrow function don't have own scope

importent side note () => arrow functions are using the outer scope as this so inside a named function the function is the scope if used directly the global object is the scope

[frank-dspeed]

cant write all examples but if you point me to a file with some pseudo code i get it working for you with comments

[ghost]

This is what I had:

process.nextTick = (f, ...args) => uWS.nextTick(f.apply(...args));

Which is obviously wrong, but worked good enough for me not to find an issue until now.

I thought this would solve it:

process.nextTick = (f, ...args) => uWS.nextTick(() => {f.apply(...args);});

But it doesn't work..?

If this works, that's like Golang and simple:

process.nextTick = (f, ...args) => {
  uWS.nextTick(() => f(...args));
}

[slavaGanzin]

While the syntax of this function is almost identical to that of call(), the fundamental difference is that call() accepts an argument list, while apply() accepts a single array of arguments.

MDN

Apply signature: (context, args)

So when you call f.apply(context, ars) it's same as:

f.call(context, ...args)

and

f.bind(context)(...args)

But if you don't need context setting (set internal this of function), you can just use splat syntax:

f(...args)

Hope this helps

[ghost]

Yeah it helped, it works now at least. Thanks

[slavaGanzin]

You're welcome. Thank you for UWS

[frank-dspeed]

@alexhultman the code is wrong apply works directly with arrays

don't use spread 3 dot operator when using apply it expects a array as secund argument

f.apply(context, args)
f.call(context, ...args)