JAVASCRIPT LONG

Analyze the code snippet:

let n = 2 3 * 3 - 1;

• 53

• 215

• 18

• 36

The number 2 is stored in the n variable: let n = 2;.

The command n = n*n*n is then called.

This last command can be replaced by:

• n **= 3;

• n ***= n;

• n **= n;

• n *= 3;

The string "12" has been written into the str variable: let str = "12";.

Then, the following operation is performed: str = +str.

As a result, the variable str will contain:

• 12

• "+12"

• "12"

• NaN

Analyze the code snippet:

let n = 10;

let m = ++n;

• n: 10, m: 10

• n: 11, m: 10

• n: 10, m: 11

• n: 11, m: 11

The result of the operation !(true && false || true) will be:

• null

• true

• false

• 1

The result of the comparison "abcd" > "Abcd" will be:

• false

• "abcd"

• 1

• true

The result of the operation 3 * 4 > 20 – 15 will be:

• -14

• NaN

• true

• false

The confirm method allows you to create a dialog box. What value does this method return when the user closes the window?

• The string entered by the user.

• It depends on the option selected by the user.

• Always true.

• Always false.

The methods

window.alert,

window.confirm, and

window.prompt

are methods of the window object.

Which of the following is not true?

• The window object represents the window in which the HTML document containing the JavaScript code currently being executed is open.

• The alert, confirm, and prompt methods require an argument specifying the position of the dialog box in which the information will be displayed.

• The alert, confirm, and prompt methods display information in modal windows that block access to the page until they are closed.

• You can call window methods, such as window.alert, without including the name window, so calling alert("abc") would be correct.

Analyze the following code:

let test = prompt("Hello", "World");

What value will the test variable have if, after running the code, we immediately press the OK button on the newly created dialog?

• true

  
  

• "Hello"

• "World"

• "OK"