AP Computer Science Principles Pre-Test

Which of the following is a valid way to declare a variable in JavaScript?

• `var myVariable;`

• `variable myVariable;`

• `declare myVariable;`

• `int myVariable;`

What will be the output of the following code snippet?

var x = 5;

var y = 10;

console.log(x + y);

• 15

• 510

• 5

• 10

Which of the following is a function declaration in JavaScript?

• `function myFunction() {}`

• `let myFunction = function() {}`

• `const myFunction = () => {}`

• `myFunction() = function() {}`

What is the scope of a variable declared with `var` inside a function?

• Global

• Local to the function

• Local to the block

• Local to the script

Consider the following code:

function add(a, b) {

return a + b;

}

What will `add(3, 4)` return?

• 34

• 7

• 12

• undefined

Which of the following is a valid way to create a list (array) in JavaScript?

• `var myList = {};`

• `var myList = [];`

• `let myList = ();`

• `let myList = <>;`

What will be the output of the following code?

var fruits = ['apple', 'banana', 'cherry'];

console.log(fruits[1]);

• apple

• banana

• cherry

• undefined

Which of the following statements correctly uses an `if` statement in JavaScript?

• `if x > 5 then { console.log(x); }`

• `if (x > 5) { console.log(x); }`

• `if x > 5: console.log(x);`

• `if (x > 5) then { console.log(x); }`

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

• Array

• Object

• String

• Function

What will be the output of the following code?

var x = "5";

var y = 5;

console.log(x == y);

• true

• false

• undefined

• null