Adding user inputs together in node.js/ javascript-CodePudding

I need to do shopping list with node that asks the user the product and the price. Then it needs to show the most expensive and cheapest product. I know how to get the price and the cheapest and most expensive values, but can't seem to figure out how I can add the product and price together.

Here is basically the raw version I have:

let array = [];

const mainfunc = () => {
  rl.question("add price : ", (aa) => {
    array.push(aa);
    console.log("---");
    console.log("Product "   aa   " added");
    console.log("added products "   array);
    console.log("Most expensive "   Math.max(...array));
    console.log("Cheapest "   Math.min(...array));
    console.log("---");
    mainfunc();
  });

};

mainfunc();

This is basically what I want the program to ask and give simplified:

Give product 1: Banana
Give price: 1
Give product 2: Apple
Give price: 2
Give product 3: Pear
Give price: 3

Most expensive item: Pear 3
Cheapest item: Banana 1

It only needs to work on node.js command line and it doesn't have to be fancy. I'm just stuck with it.

CodePudding user response：

You can store product and price in an array of objects.

For example:

const productPrices = []

productPrices.push({
  productName: "ABC",
  price: 20
})

productPrices.push({
  productName: "XYZ",
  price: 30
})

// Find product having max price
productPrices[productPrices.indexOf(Math.max(...productPrices(p => p.price)))]

// Find product having cheapest price
productPrices[productPrices.indexOf(Math.min(...productPrices(p => p.price)))]

CodePudding user response：

const util = require('util');
const readline = require('readline');

const cli = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});
const question = util.promisify(cli.question).bind(cli);

const PRODUCTS_COUNT = 4;
const productQuestions = ['Give product', 'Give price: '];
const answers = [];
let tmp = {};

const questions = [...Array(PRODUCTS_COUNT * 2)]
    .map((_, index) => index % 2 ? productQuestions[1] : `${productQuestions[0]} ${index / 2   1}: `)
    .map((item, index) => () => new Promise(async (resolve, reject) => {
        try {
            const answer = await question(item);

            if ( index % 2 ) {
                tmp.price = Number(answer);
                answers.push(tmp);
                tmp = {};
            } else {
                tmp.product = answer;
            }

            resolve();
        } catch {
            reject();
        }
    }));

(async () => {
    for ( const question of questions ) {
        await question();
    }

    console.log(answers);
    process.exit(0);
})();