JavaScript_G9_Quiz

It's a complex programming language that creates dynamic programming.

• HTML

• Python

• JavaScript

• CSS

Answer explanation

JavaScript is a complex programming language specifically designed for creating dynamic content on websites, making it the correct choice. HTML and CSS are markup and styling languages, while Python is a general-purpose programming language.

Which of the following is a data type in JavaScript that represents a value that cannot be altered?

• Mutable

• Reference

• Primitive

• Composite

Answer explanation

In JavaScript, 'primitive' data types (like numbers, strings, and booleans) are immutable, meaning their values cannot be changed once created. This distinguishes them from 'non-primitive' types, such as objects, which can be modified.

Which keyword is used in JavaScript to declare a variable that cannot be reassigned?

• const

• let

• var

• final

Answer explanation

In JavaScript, 'let' is used to declare variables that can be reassigned. Unlike 'const', which is for constants, and 'var', which has function scope, 'let' provides block scope and allows for reassignment.

const greeting= "good morning";

What could be the mistakes in the code if it shows error in the result?

Answer explanation

Excessive spacing

keywords such as if, switch, and for, spaces are usually added before and after the__________?

Ex. if 10<8

• Indention

• Whietspace

• semi colon

• Parentheses

Answer explanation

In programming, keywords like 'if', 'switch', and 'for' typically have spaces added before and after their parentheses. This improves readability and helps distinguish the condition from the keyword itself.

A fundamental data type that can hold one of two possible values: true or false.

During a group project, Charlotte noticed that one of the team members was not contributing anything to the discussion. When asked about their input, they simply stated that they had nothing to add. What does this indicate about their involvement?

• Null
• Undefined

• Error

• None

Which of the following are considered Primitive data types?

• Number, boolean, and null

• String, array, and object

• Boolean, undefined, and symbol

• String, number, and null

Answer explanation

Primitive data types include basic types like String, Number, and Boolean. These represent simple values, while the other options include non-primitive or irrelevant items, making 'String, number and boolean' the correct choice.

var strvar =’Please,please,please’ + by Sabrina Carpenter;

console.log(strVar);

Write the correct script to make the result show "Please,please,please by Sabrina Carpenter

var flag=true;

//flag=false;

console.log(flag);

Write the correct script to make the result show "true"