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1. 1. What is JavaScript commonly used for in a web page?

   What is JavaScript commonly used for in a web page?

   Defining DNS records Storing MySQL tables directly Adding behavior and interactivity Replacing HTTP
   Hint

   Identify what the command or language feature is responsible for.

2. 2. What does let declare?

   What does let declare?

   A database index A PHP class A block-scoped variable that may be reassigned A permanent HTML element
   Hint

   Identify what the command or language feature is responsible for.

3. 3. What does const declare?

   What does const declare?

   A value that can never contain an object A global PHP constant A block-scoped binding that cannot be reassigned An immutable database
   Hint

   Identify what the command or language feature is responsible for.

4. 4. Which value is a JavaScript string?

   Which value is a JavaScript string?

   null 'WordPress' 42 true
   Hint

   Identify what the command or language feature is responsible for.

5. 5. What does === compare in JavaScript?

   What does === compare in JavaScript?

   Only variable names Values after automatic string conversion Object property count Value without type coercion
   Hint

   Identify what the command or language feature is responsible for.

6. 6. What is a JavaScript array?

   What is a JavaScript array?

   A CSS declaration An HTTP cookie only An ordered collection of values A PHP namespace
   Hint

   Identify what the command or language feature is responsible for.

7. 7. What is a plain JavaScript object commonly used for?

   What is a plain JavaScript object commonly used for?

   Compiling PHP Defining a SQL table automatically Grouping named properties and values Encrypting HTTPS
   Hint

   Identify what the command or language feature is responsible for.

8. 8. What is a JavaScript function?

   What is a JavaScript function?

   Reusable executable code that may accept inputs and return a value A fixed HTML attribute A database server A network port
   Hint

   Identify what the command or language feature is responsible for.

9. 9. Which syntax begins a simple arrow function?

   Which syntax begins a simple arrow function?

   function -> callback :: def value: (value) =>
   Hint

   Identify what the command or language feature is responsible for.

10. 10. What does an if statement do?

    What does an if statement do?

    Creates an HTML document Repeats code a fixed number of times Runs code when a condition is truthy Sends an HTTP request automatically
    Hint

    Identify what the command or language feature is responsible for.

11. 11. What does array.forEach( callback ) do?

    What does array.forEach( callback ) do?

    Stops the browser Calls the callback for each array element Creates a database table Returns only matching elements
    Hint

    Identify what the command or language feature is responsible for.

12. 12. What does array.map( callback ) return?

    What does array.map( callback ) return?

    A new array containing transformed results An HTML form The original array sorted in place Only a boolean
    Hint

    Identify what the command or language feature is responsible for.

13. 13. What does array.filter( callback ) return?

    What does array.filter( callback ) return?

    A PHP error The array length A new array containing accepted elements A single object only
    Hint

    Identify what the command or language feature is responsible for.

14. 14. What does document.querySelector( selector ) return?

    What does document.querySelector( selector ) return?

    Every matching element as an array The first matching element or null A database result A CSS file
    Hint

    Identify what the command or language feature is responsible for.

15. 15. What does addEventListener() do?

    What does addEventListener() do?

    Stores a browser password Registers a callback for an event Creates a WordPress hook in PHP Adds a CSS class only
    Hint

    Identify what the command or language feature is responsible for.

16. 16. What does event.preventDefault() do?

    What does event.preventDefault() do?

    Deletes the event target Stops all JavaScript forever Removes every listener Prevents the browser default action for that event when cancelable
    Hint

    Identify what the command or language feature is responsible for.

17. 17. What does JSON.parse( text ) do?

    What does JSON.parse( text ) do?

    Converts valid JSON text into a JavaScript value Validates HTML Converts an object into JSON text Runs PHP code
    Hint

    Identify what the command or language feature is responsible for.

18. 18. What does JSON.stringify( value ) do?

    What does JSON.stringify( value ) do?

    Fetches a URL Creates a Promise automatically Parses HTML Converts a supported JavaScript value into JSON text
    Hint

    Identify what the command or language feature is responsible for.

19. 19. What does a Promise represent?

    What does a Promise represent?

    A CSS transition A PHP interface The eventual completion or failure of asynchronous work A synchronous loop only
    Hint

    Identify what the command or language feature is responsible for.

20. 20. What does await do inside an async function?

    What does await do inside an async function?

    Pauses that async function until a promise settles Blocks the entire web server Makes every value synchronous Creates a new DOM element
    Hint

    Identify what the command or language feature is responsible for.