ArrayList.js

// ****************************************************************************
class ArrayList {
    // ------------------------------------------------------------------------
    constructor() {
        this.length = 0;
        this.data = {};
    }

    // ------------------------------------------------------------------------
    get(index) {
        return this.data[index];
    }

    // ------------------------------------------------------------------------
    push(item) {
        this.data[this.length] = item;
        this.length++;
        return this.length;
    }

    // ------------------------------------------------------------------------
    pop() {
        const lastItem = this.data[this.length-1];
        delete this.data[this.length-1];
        this.length--;
    }
    
    // ------------------------------------------------------------------------
    delete(index) {
        const item = this.data[index];
        this.shiftItems(index);
    }

    // ------------------------------------------------------------------------
    shiftItems(index) {
        for (let i = index; i < this.length - 1; i++) {
            this.data[i] = this.data[i + 1];
        }
        delete this.data[this.length-1];
        this.length--;
    }
}

// ****************************************************************************
const newArray = new ArrayList();
newArray.push('hello');
newArray.push('you');
newArray.push('!');
// newArray.pop();
newArray.delete(1);
console.log(newArray);