could you help me!
In the emit method how to check they call room method previous or not.
In the two cases below:
// case 1: A.room('aa').emit('a1', 'aaa')
// case 2: A.emit('a2', 'aaa')
this is a class A
class A {
static room(r) {
this.r = r
return this
}
static emit(event, data) {
//todo
console.log('this.r', this.r, {event, data})
}
}
Thank for your time!
You need to store flow values like r separately for each call, which is not reasonable aim for static classes because you use same same class again and again, instead of separate instanses. Possible solutions:
1. No longer static:
class A {
room(r) {
this.r = r
return this
}
emit(event, data) {
console.log('this.r', this.r, {event, data})
}
}
new A().room('aa').emit('a1', 'aaa') // r = 'aa'
new A().emit('a2', 'aaa') // r = undefined
2. Return instances with own scopes (A keeps static):
class A {
static room(r) {
return new B(r)
}
static emit(...args) {
return new B().emit(...args)
}
}
class B {
constructor(r) {
this.r = r
}
emit(event, data) {
console.log('this.r', this.r, {event, data})
return this
}
}
A.room('aa').emit('a1', 'aaa') // r = 'aa'
A.emit('a2', 'aaa') // r = undefined
3. Delegate logic to non-static class (A keeps static):
class B {
room(r) {
this.r = r
return this
}
emit(event, data) {
console.log('this.r', this.r, {event, data})
}
}
class A {
static room(...args) {
return new B().room(...args);
}
static emit(...args) {
return new B().emit(...args);
}
}
A.room('aa').emit('a1', 'aaa') // r = 'aa'
A.emit('a2', 'aaa') // r = undefined
... and so on.