Simple Stack and Set DataStructures - Example for CodeAfrique Students

index.js

class Stack {
  constructor() {
    this.stack = [];
  }

  push(item) {
    this.stack.unshift(item);
  }

  pop() {
    this.stack = this.stack.slice(1, );
  }

  peek() {
    return this.stack[0];
  }

  size() {
    return this.stack.length;
  }
};

const stack = new Stack()
stack.size()

class Set {
  constructor() {
    this.collection = [];
  }

  hasItem(item) {
    return this.collection.includes(item);
  }

  values() {
    return this.collection.forEach(item => console.log(item));
    // return this.collection.toString();
  }

  _addItemToCollection(item) {
    this.collection.push(item);
    return true;
  }

  add(item) {
    this.hasItem(item) ? false : this._addItemToCollection(item);
  }

  _removeItemFromCollection(item) {
    this.collection = this.collection.filter(i => i != item);
    return true;
  }

  remove(item) {
    this.hasItem(item) ? this._removeItemFromCollection(item) : false;
  }
}

const colSet = new Set();

colSet.add("item")

colSet.collection