src index.ts

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  // LIFO implementation
// @src https://basarat.gitbook.io/algorithms/datastructures/stack
export class Stack<Element> {
    private store: Element[] = [];
 
    public push(item: Element): number {
        return this.store.push(item);
    }
 
    public pop(): Element | undefined {
        return this.store.pop();
    }
 
    public size(): number {
        return this.store.length;
    }
 
    public peek(): Element | null {
        return null != this.store[this.store.length - 1] ? this.store[this.store.length - 1] : null;
    }
}