JavaScript Data Types Challenges

Objectives
Identify 5 primitive data types and know when to use them
Explain the difference between primitive and reference data types
Explain the difference between dynamic and statically typed languages
Use the JS console to manipulate data and create objects

Challenges

  1. Store your first name in a string variable
  2. Concatenate your last name with your first name
  3. Use split to turn your string variable into an array
  4. Use typeof to show how the output of split is different from the input
  5. Define a new array and concatenate the first and last elements

Stretch Challenges

  1. Explain why null == undefined and null !== undefined are both true statements.
  2. Find a partner to exchange secret messages with
    • How you encode your message is up to you.
    • You might want to convert your message to binary and/or use some built-in JS functions (slice, replace, etc) to obscure the data you are sending.
    • Get creative and make sure to include detailed instructions so that your partner knows how to decode the message.

Example

  1. Convert this binary data to text:
    01100001 01110111 01100101 01110011 01101111 01101101 01100101 00101100 00100000 01100100 01101111 01100111 01110011 00100000 01100001 01110010 01100101
  2. Open the JS console and store the decoded string in a variable:
    var message = decoded_string_here;
  3. Translate from yodaspeak to regular english:
    message = message.split(", ");
message = message[1] + " " + message[0];

Extra Credit

Send the instructions for decoding via email and the message body via slack for extra security. How is this similar to public/private key cryptography?