how to make a calculator in discord.js V12 code example

Example: discord.js calculator command

const math = require('discord-math'); module.exports = {    name: "calculate",    description: "The bot does math for you"    run: async (client, message, args) => {        try {            let num1 = args[0];            let operation = args [1];            let num2 = args[2];                        if (!num1) return message.channel.send('Num1 needs to be specified!');            if (!operation) return message.channel.send('An operation was not specified!');            if (!num2) return message.channel.send('Num2 needs to be specified!');             message.channel.send(`Answer: ${math.calculate(num1, operation, num2)}`);        } catch (e) {            console.log(e);        }    }}