I have two classes, A and B. I will only be setting the values of class A and I want class B variables to hold the same value as class A or have have access to all values of class A variables. In my case, class A and B should not be inherited logically. Is this possible without inheritance?.
In the below code, I have given an example where I need the value of only one variable and I could have passed the name as a method param. But, in my actual project I need to set the value of 20+ variables and it is not easy to pass around 20+ values to another class.
class B {
name: string
age: number
print() {
console.log(this.name);
}
}
const b = new B();
class A {
name: string;
age: number;
printValues() {
b.print()
}
}
const a = new A();
a.name = "TOM"
a.printValues() // Want to Print TOM4
A should have a property that links it to a B instance. Then you can use a setter to pass the name assignment through.
class B {
name: string
age: number
print() {
console.log(this.name);
}
}
const b = new B();
class A {
age: number;
b: B;
constructor(b) {
this.b = b;
}
get name() {
return this.b.name;
};
set name(new_name) {
this.b.name = new_name;
}
printValues() {
this.b.print()
}
}
const a = new A(b);
a.name = "TOM"
a.printValues() // Want to Print TOM1
You can simultaneously assign values to both instances with Proxy:
class B{
print() {
Object.entries(this).forEach(([k,v]) => console.log(k, ':', v));
}
}
const b = new B();
class A {
constructor(b){
return new Proxy(this, {
set(_, prop, val, proxy){
b[prop] = val;
return Reflect.set(...arguments);
}
});
}
printValues() {
b.print()
}
}
const a = new A(b);
a.name = "TOM";
a.age = 33;
a.printValues() // Want to Print TOMBut better save b in the a instance with the A’s constructor argument or create b in the A’s constructor.