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Grokking JavaScript Fundamentals

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How do you define a function in JavaScript that calculates the sum of two numbers?

Choose all correct options

function sum(a + b) { return a + b; }

function sum(a, b) { return a + b; }

sum(a, b) => return a + b;

let sum = function(a, b) { return a + b; };

What is the default return value of a function in JavaScript that does not explicitly return a value?

A

null

B

0

C

undefined

D

false

How do you declare a function with default parameters in JavaScript?

Choose all correct options

function greet(name = "Guest") { console.log("Hello, " + name); }

function greet(name: "Guest") { console.log("Hello, " + name); }

function greet(name || "Guest") { console.log("Hello, " + name); }

let greet = function(name = "Guest") { console.log("Hello, " + name); };

What is output by the following arrow function in JavaScript?

let add = (a, b) => a + b;
console.log(add(5, 7));

A

12

B

7

C

undefined

D

Error

Which statement is true about variable scope within a JavaScript function?

A

Variables declared with var inside a function are global.

B

Variables declared with let inside a function can be accessed outside the function.

C

Variables declared with var inside a function are local to the function.

D

Variables declared with const inside a function are hoisted to the global scope.

.....

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