Skip to content

Instantly share code, notes, and snippets.

@Raj-Hunjan

Raj-Hunjan/README.md

Forked from acidtone/README.md
Created October 7, 2021 14:54
Show Gist options
  • Save Raj-Hunjan/981b81a735fd05bf4830b815339c6c45 to your computer and use it in GitHub Desktop.
Save Raj-Hunjan/981b81a735fd05bf4830b815339c6c45 to your computer and use it in GitHub Desktop.
Download ZIP
JS Activity: Tip Calculator
Raw
README.md

Tip Calculator

Overview

Beginner activities based on a simple Tip Calculator.

Topics covered

Javascript features used in this script:

Activities

In no particular order, refactor this script to add/improve features:

  1. For some reason, you don't like the * arithmetic operator being passed as a console.log() argument.
    • Declare a new tipPercentage variable that outputs 18% (or similar) and log that new variable in the console.log(), instead.
  2. You realize it might be useful to know the total payment to the server.
    • Declare a new paymentTotal variable and set its value to the billTotal plus tip.
  3. Last time you checked, there's no coin for $0.00001.
  4. You realize you've been tipping on the tax portion of the bill!
    • Refactor the script so that it calculates the tip based on the sub total before tax.
  5. Stretch: This app is great, but billTotal is fixed.
    • If you're running this code using Node:
      1. Using the process.argv array in Node, refactor this script so that it accepts a billTotal value from the command line when you run the script.

Running this code

Browser

To run tip-calculator.js from the browser:

  1. Download or clone this Gist into your workspace;

  2. In this new directory, create a valid index.html file;

  3. In the <head> of index.html, link to tip-calculator.js with a <script> tag:

    <script src="tip-calculator.js">

  4. Run index.html in the browser of your choice;

  5. Open the Web Console to view the output.

Node

Alternatively, if you have Node installed, tip-calculator.js can be run from the command line:

  1. Download or clone this Gist into your workspace;
  2. Navigate to this directory from the command line;
  3. Run the file using Node: $ node tip-calculator.js
Raw
tip-calculator.js
// Assign initial values
const billTotal = 40;
const tipRate = .18;
// Calculate tip
const tip = billTotal * tipRate;
// Output result with template literals
console.log(`Tip for $${billTotal} at ${tipRate * 100}%: $${tip}.`);
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment