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README.md

JavaScript exercises, Part I. (basics)

Exercise #1: Display options

Look at the different display examples and execute them by opening the files on your local computer.

Exercise #2: Lucky number seven

  • Create a HTML page with a <script> block embedded in the <head>.
  • Write JS code that outputs the numbers from 1 to 10.
  • For the number 7 it should print the word "seven" instead.
  • Use the web developer console of the browser to see the results.

Exercise2

Exercise #2b: Lucky number seven, with a list

  • Solve the previous exercise, but instead of writing the output to the browser console, display it as an unordered HTML list (using document.write()).
  • Embed the <script> block inside the <body>.
  • You need to create the entire list (including <ul> and </ul>) using JavaScript! In other words, there cannot be anything outside <script>...</script> in the body part of your document.

Exercise2b

Exercise #3: Greatest common divisor

  • Write a function gcd(a,b) that takes two integers as input and returns their greatest common divisor.
  • The simplest implementation is using Euclid's algorithm.
  • Call the function with values 48 and 18 and write the output to the console.

Exercise #3b: Prompting values

  • Extend the previous exercise such that the integers a and b are entered by the user. Use the prompt() method for reading in the values.
  • Write the result to the document.
  • Pro: Extend the code so that only valid integers with a value greater than zero are accepted as input. (Keep prompting for a number until it is valid.)

Exercise3b/1 Exercise3b/2

Exercise #4: Bank account

  • Create a BankAccount class.
  • The constructor takes two variables: name and initial balance.
  • The class has two methods: deposit(amount) and withdraw(amount).
  • Upon withdrawal check if the person has sufficient funds (and display an error message if not).
  • Write all JS code to the exercise4.js file. The HTML file exercise4.html contains code for testing your class. (Use the web developer console of the browser to see the output.)

Exercise4

Exercise #5: String reversal

  • Write a reverse(s) function that reverses the input string s.
  • For example, reverse("test string") should return "gnirts tset".

Exercise #6: Bank account with logging

  • Extend the BankAccount class from Exercise #4 such that all transactions are logged.
  • For each transaction, store date, transaction (deposit/withdrawal), old balance, new balance, and whether the transaction was successful.
  • Use the built-in Array and Date classes.

Exercise #6b: Displaying transaction log

  • Extend the previous exercise such that the transaction log is displayed in a HTML table (as opposed to writing it to the console).
  • Use CSS to style the table.

Exercise6b