Tips for dealing with strong reference cycles in TypeScript?

I have created a tree-like structure in my implementation, consisting of parent and child objects. The parents contain a list of children while the children have references to their parents, facilitating easy navigation through the tree. I am now contemplating whether such a structure will ever be garbage collected due to the presence of strong reference cycles (as I am not aware of weak pointers in TypeScript).

Below is a basic example of this structure:

class Symbol {
    protected parent: Symbol | undefined;
    protected children: Symbol[];
}

What is the recommended strategy for dealing with this type of data structure? Should I consider using the newer WeakMap or WeakSet classes to reference parents (even though it may seem cumbersome)?

typescript

Answer №1

When it comes to representing trees, the best method can vary depending on the specific needs of your tree structure.
If you're satisfied with your current setup and are primarily concerned about garbage collection, consider implementing a remove method for your nodes.

class MySymbol {
    protected parent: MySymbol | undefined;
    protected children: MySymbol[];

    remove() {
        this.children = [];
        this.parent && this.parent.childRemoved(this);
    }

    childRemoved(child: MySymbol) {
        this.children.splice(this.children.indexOf(child), 1);
    }
}

(please note that I changed Symbol to MySymbol to avoid duplicate name errors)

This approach works well if each child has only one parent; otherwise, adjustments will need to be made.

Edit

To achieve similar functionality, consider using a WeakMap for managing your children.
For additional insights, check out this answer here: Creating a regular weak-reference in Javascript using WeakMaps

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