JavaScript Functions Quiz

What keyword is used to define a function in JavaScript?

• define

• func

• function

• method

Which of the following defines a function expression?

• function greet() {}

• const greet = function() {};

• function = greet() {};

• let greet = () => {}

Which function type is not hoisted in JavaScript?

• Function declaration

• Function expression

• Arrow function

• Both B and C

What will this code print?

console.log(square(4));

const square = n => n * n;

• 16

• Error

• undefined

• NaN

Arrow functions were introduced in which version of JavaScript?

• ES5

• ES6

• ES7

• ES2019

What is the correct syntax for an arrow function that adds two numbers?

• (a, b) => a + b

• a, b => { return a + b }

• a, b -> a + b

• => (a + b)

What is the output of this function?

• Hello

• Hello undefined

• Hello Guest

• Error

Which of the following returns a value from a function?

• output

• echo

• return

• print

What is a higher-order function?

• A function that calls itself

• A function that takes or returns another function

• A function declared inside another

• A recursive function

Which of the following is an example of a callback?

• Function passed as argument

• Function that runs first

• Function without parameters

• Function with default values