index.js

// Complete the Numbers class below
// the constructor has already been provided
class Numbers {
    constructor(data){
        //data can either be a string or an array of numbers
        if (typeof data === "string"){
            this.data = str.split(",").map((number) => number * 1);
        } else {
            this.data = data;
        }
    }

    count() {
        //return the count of numbers in data
        return this.data.length;
    }

    printNumbers() {
        //print the numbers in data
        this.data.forEach((number) => {
            console.log(`Number: ${number}`);
        });
    }

    odds() {
        //return the odd numbers in data
        return this.data.filter(number => number % 2 !== 0);
    }

    evens() {
        //return the even numbers in data
        return this.data.filter(number => number % 2 === 0);
    }

    sum() {
        //return the sum of the numbers
        return this.data.reduce((total, number) => total + number, 0);
    }

    product() {
        //return the product of the numbers
        return this.data.reduce((product, number) => product * number, 1);        
    }

    greaterThan(target){
        //return the product greater than the target
        return this.data.filter(number => number > target);
    }
    
    howMany(target) {
        //return the count of a given number
        return this.data.filter(number => number === target).length;
    }
}

//Prompt the user for a list of integers separated by comas
const str = prompt("enter some numbers, like this ", "1,2,3,3,5,9");

//create a instance of numbers
const n1 = new Numbers(str);
console.log(n1.count()); //returns count of numbers
n1.printNumbers(); //prints the number along with their indexes
console.log(n1.odds()); //returns odd numbers
console.log(n1.evens()); //returns even numbers
console.log(n1.sum()); //returns sum of numbers
console.log(n1.product()); //returns product of numbers
console.log(n1.greaterThan(3)); //returns numbers greater than another number
console.log(n1.howMany(3)); //returns the count of a specific number