JavaScript Basics Vocabulary

Word Bank

JavaScript Node.js variable
let const string
number boolean console.log
concatenation operator  

Fill In the Blanks

  1. is a programming language that runs on many different devices.
  2. lets us run JavaScript outside of a web browser, like in the terminal.
  3. A is like a labeled box where you store information.
  4. Use when a variable might change; use when it stays the same.
  5. A is text wrapped in quotes, like “Hello”.
  6. A is a numeric value without quotes, like 42.
  7. A is either true or false.
  8. displays information in the terminal so you can see what your program is doing.
  9. is joining strings together using the + symbol.
  10. An is a symbol that performs an action, like + or -.

Quick Checks

  • Circle the valid variable names: myName / my-name / my name / firstName
  • Draw a line matching data types to examples:
    • String             42
    • Number           "Hello"
    • Boolean           true

Stretch: Code Detective

Find and circle the mistake in this code:

let my name = "Sam;
const age = 12;
console.log("I am" + name + "years old");

Hint: Look for missing quotes, spaces in names, and missing spaces in output!