mk-calculator/root/index.ts

TypeScript Calculator Project

#!/usr/bin/env node
import inquirer from "inquirer";
import chalk from "chalk";
import chalkAnimation from "chalk-animation";

const sleep = (ms = 2000) => new Promise<void>((r) => setTimeout(r, ms));

async function welcome() {
  const welcomeMessage = chalkAnimation.rainbow(
    `Welcome To Muhammad Khubaib's Calculator\n`
  );

  await sleep();
  welcomeMessage.stop();
}

await welcome();

let restartCalc = true;

do {
  const answer = await inquirer.prompt([
    {
      name: "operator",
      type: "list",
      message: "Please select your desire Operation: ",
      choices: [
        "Addition",
        "Subtraction",
        "Multiplication",
        "Division",
        "x Raise to the Power y",
      ],
    },

    {
      name: "firstNumber",
      type: "number",
      message: "Please Enter first Number: ",
    },

    {
      name: "secondNumber",
      type: "number",
      message: "Please Enter Second Number: ",
    },
  ]);
  if (!isNaN(answer.firstNumber) && !isNaN(answer.secondNumber)) {
    let result: number = calculation(
      answer.operator,
      answer.firstNumber,
      answer.secondNumber
    );

    if (answer.operator === "x Raise to the Power y") {
      console.log(
        chalk.greenBright(
          `${answer.firstNumber} raise to the power ${answer.secondNumber} is: ${result}`
        )
      );
    } else {
      console.log(chalk.greenBright(`Answer: ${result}`));
    }
  } else {
    console.log(chalk.redBright(`Wrong Entry, You must enter Numbers Only!`));
  }

  const restart = await inquirer.prompt([
    {
      name: "reset",
      type: "input",
      message: "Do you want to continue operation: Y/N",
    },
  ]);

  restartCalc =
    restart.reset === "Y" ||
    restart.reset === "y" ||
    restart.reset === "Yes" ||
    restart.reset === "yes"
      ? true
      : false;
} while (restartCalc);

function calculation(opt: string, numFirst: number, numSecond: number): number {
  switch (opt) {
    case "Addition":
      return numFirst + numSecond;
    case "Subtraction":
      return numFirst - numSecond;
    case "Multiplication":
      return numFirst * numSecond;
    case "Division":
      return numFirst / numSecond;
    case "x Raise to the Power y":
      return numFirst ** numSecond;
  }
  return 0;
}