How to create custom clone method for typescript class.

I'm trying to recreate the

Instance.Clone()

Instance.Clone()

method, but cloning a typescript class instance instead of a roblox instance, I just can't figure out how to do it while keeping the methods and functionality the same. I've tried: The spread operator (

{ ...instance }

{ ...instance }

), copy/deepCopy from the object-utils package (

Object.deepCopy(instance)

Object.deepCopy(instance)

)

// class.ts

export default class Foo {
  Bar = "x";

  constructor(bar: string) {
    this.Bar = bar;
  }

  // Custom clone method
  clone(): typeof this {
    // Do some cloning logic while keeping all members, methods, and functionality    

    return NewClone;
  }

  returnSomething() {
    return "Something";
  }
}

// class.ts

export default class Foo {
  Bar = "x";

  constructor(bar: string) {
    this.Bar = bar;
  }

  // Custom clone method
  clone(): typeof this {
    // Do some cloning logic while keeping all members, methods, and functionality    

    return NewClone;
  }

  returnSomething() {
    return "Something";
  }
}

Intended behavior

// somescript.ts

import Class from "./class.ts";

const Instantiated = new Class("Test");
const Cloned = Instantiated.clone();

print(Instantiated.Bar === Cloned.Bar) // true
print(Instantiated.returnSomething() === Cloned.returnSomething()) // true

// somescript.ts

import Class from "./class.ts";

const Instantiated = new Class("Test");
const Cloned = Instantiated.clone();

print(Instantiated.Bar === Cloned.Bar) // true
print(Instantiated.returnSomething() === Cloned.returnSomething()) // true

Solution:

If anyone has this same issue just use

table.clone(instance)

table.clone(instance)

Thanks bitsplicer...

Jump to solution

9 Replies

𝐉𝐚𝐦 ꨄOP•3w ago

Figured it out! Here's my implementation

class Something {
  ...

  clone(): typeof this {
        const clone = {};

        Object.entries(this).forEach(([key, value]) => {
            Object.assign(clone, { [key as any]: value });
        });
        
        const thisMetatable = getmetatable(this) as LuaMetatable<any>;
        return setmetatable(clone as typeof this, thisMetatable);
    }
}

class Something {
  ...

  clone(): typeof this {
        const clone = {};

        Object.entries(this).forEach(([key, value]) => {
            Object.assign(clone, { [key as any]: value });
        });
        
        const thisMetatable = getmetatable(this) as LuaMetatable<any>;
        return setmetatable(clone as typeof this, thisMetatable);
    }
}

Some tests

const NewInstance = new Something();

NewInstance.x = 0;
NewInstance.something = 1;

const Clone = NewInstance.clone();

print(Clone === NewInstance) // false (intended)
print(Clone.x === NewInstance.x) // true
print(Clone.something() === NewInstance.something()) // true

const NewInstance = new Something();

NewInstance.x = 0;
NewInstance.something = 1;

const Clone = NewInstance.clone();

print(Clone === NewInstance) // false (intended)
print(Clone.x === NewInstance.x) // true
print(Clone.something() === NewInstance.something()) // true