JavaScript - Creating New Object

You can create a javascript object in a few different ways. You can define it hard-coded style (object literal) ...

// object literal
let Spaceship = { Designation : "NCC-1701", Name : "Enterprise" };
document.getElementById("demo1").innerHTML = Spaceship.Designation;

You can use a function and a constructor...

let color = "Red";
let speed = "Fast" ;
let car = new Car(color, speed);

function Car(color, speed)
{
    this.Color = color;
    this.Speed = speed;
}

Here is a more advanced version. It is an object in which the properties are functions. This is a kind of "utility" object.

const utils =
{
    // Sum an array
    sum: arr => arr.reduce((acc, curr) => acc + curr, 0),

    // create an array of numbers between min and max (edges included)
    range: (min, max) => Array.from({ length: max - min + 1 }, (_, i) => min + i),

    // pick a random number between min and max (edges included)
    random: (min, max) => min + Math.floor(Math.random() * (max - min + 1)),

    // Given an array of numbers and a max...
    // Pick a random sum (< max) from the set of all available sums in arr randomSumIn: (arr, max)=> {
    const sets = [[]];
    const sums = [];
    for (let i = 0; i < arr.length; i++)
    {
        for (let j=0, len=sets.length; j < len; j++)
        {
            const candidateSet=sets[j].concat(arr[i]);
            const candidateSum=utils.sum(candidateSet);

            if (candidateSum <=max)
            {
                sets.push(candidateSet); sums.push(candidateSum);
            }
        }
    }
    return sums[utils.random(0, sums.length - 1)];
    },
};