AP Computer Science Principles Quiz

What is the correct way to declare a variable in JavaScript?

• `var myVariable;`

• `int myVariable;`

• `declare myVariable;`

• `variable myVariable;`

Which of the following is a valid data type in JavaScript?

• `integer`

• `string`

• `character`

• `decimal`

What will the following code output? `console.log(typeof 42);`

• `number`

• `string`

• `boolean`

• `undefined`

Which of the following is a control structure used for decision making in JavaScript?

• `for`

• `if`

• `while`

• `switch`

What is the output of the following code snippet? ```javascript let x = 5; x += 3; console.log(x); ```

• `5`

• `8`

• `3`

• `15`

Which keyword is used to define a constant in JavaScript?

• `var`

• `let`

• `const`

• `static`

What will the following code output? `console.log(2 + "2");`

• `4`

• `22`

• `NaN`

• `undefined`

Which of the following is a loop structure in JavaScript?

• `if`

• `switch`

• `for`

• `case`

What is the purpose of the `break` statement in JavaScript?

• To exit a loop or switch statement

• To pause the execution of a function

• To terminate the program

• To skip the current iteration of a loop

Which of the following is a basic debugging technique in JavaScript?

• Using `console.log()`

• Using `alert()`

• Using `prompt()`

• Using `confirm()`