JavaScript Programming Language Overview

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Questions and Answers

What is the purpose of a function in JavaScript?

To control the flow of execution using conditions.

To declare variables within a specific scope.

To convert data types from one format to another.

To create reusable blocks of code that perform a specific task. (correct)

Which of the following correctly defines a simple function in JavaScript?

myFunction() = function() { return 'Hello World'; };

function: myFunction() { console.log('Hello World'); }

function myFunction() { console.log('Hello World'); } (correct)

let myFunction = function() { console.log('Hello World'); }; (correct)

How do you call a function named 'calculateSum' in JavaScript?

calculateSum(); (correct)

invoke calculateSum() with parameters;

calculateSum[];

call calculateSum();

What will the following snippet output? function test() { return 'Hello'; } console.log(test());

'Hello' (D) Signup and view all the answers

What feature do functions provide that allows code to be reused?

Encapsulation (C) Signup and view all the answers

In which scenario would you typically use a function?

To execute a block of code in response to an event. (B) Signup and view all the answers

What does the return statement do in a function?

It ends the function execution and returns output. (B) Signup and view all the answers

What will be the output of the following code: `let result = 40 + 50; console.log(result);`?

90 (D) Signup and view all the answers

Which operator is used for the subtraction operation in JavaScript?

<ul> <li>(A)</li> </ul> Signup and view all the answers

What does the expression `let remainder = 10 % 2;` evaluate to?

0 (A) Signup and view all the answers

Given `let isEmpty = false; let isComplete = true;`, what will `console.log(isEmpty || isComplete);` output?

true (D) Signup and view all the answers

What is the result of `let num1 = 12; let num2 = 12; let result = num1 * num2; console.log(result);`?

144 (D) Signup and view all the answers

Which operator would you use to assign the value of a variable?

= (B) Signup and view all the answers

In the expression `let resultDivide = 20 / 10;`, what does the division operator (/) return?

2 (A) Signup and view all the answers

What will the output be for `let isComplete = true; console.log(!isComplete);`?

false (D) Signup and view all the answers

If `let a = 90; let b = a;` is executed, what will be the value of `b`?

90 (D) Signup and view all the answers

Which keyword is NOT used to declare a variable in JavaScript?

define (B) Signup and view all the answers

What type of data does the variable 'isLoggedIn' represent?

Boolean (D) Signup and view all the answers

In the statement 'let wholeNum = 23;', what data type is 'wholeNum' categorized as?

Number (B) Signup and view all the answers

What data type is used to represent a collection of related values in JavaScript?

Array (A) Signup and view all the answers

How can you access the name property of an object called 'person'?

console.log(person.name); (D) Signup and view all the answers

What will the variable 'oddNumber' hold after its declaration 'let oddNumber;'?

undefined (A) Signup and view all the answers

Which of the following is NOT a primitive data type in JavaScript?

Object (D) Signup and view all the answers

If 'myArray' is defined as 'let myArray =[“apple”,25,true];', what is the second element of the array?

25 (C) Signup and view all the answers

What does the statement 'const isEmpty = true;' imply about isEmpty?

isEmpty is assigned a Boolean value and cannot be reassigned. (A) Signup and view all the answers

Study Notes