JavaScript Quiz Day-1

What is JavaScript primarily used for in web development?

• Server-side scripting

• Database management

• Front-end development

• Operating system development

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

• var myVar = 10;

• variable myVar = 10;

• declare myVar = 10;

• None of the above

Which of the following is not a data type in JavaScript?

• String

• Number

• Boolean

• Character

Which of the following is the correct way to declare a function in JavaScript?

• function myFunction() {}

• func myFunction() {}

• declare function myFunction() {}

• define function myFunction() {}

How do you create an object in JavaScript?

• var obj = {};

• var obj = [];

• var obj = ();

• var obj = <>;

What will be the output of the following code? var a = "Hello"; var b = "World"; var c = a + " " + b; console.log(c);

• HelloWorld

• Hello World

• Hello

• World

Which of the following correctly creates an array in JavaScript?

• var arr = "apple", "banana", "cherry";

• var arr = ["apple", "banana", "cherry"];

• var arr = ("apple", "banana", "cherry");

• None of the above

What is the output of the following JavaScript code? var isJavaScriptFun = true; console.log(isJavaScriptFun);

• true

• false

• undefined

• null

Which of the following statements is true regarding the `undefined` and `null` data types in JavaScript?

• `undefined` means a variable has been declared but not assigned a value; `null` is an assignment value that represents no value.

• `null` means a variable has been declared but not assigned a value; `undefined` is an assignment value that represents no value.

• Both `undefined` and `null` are identical and can be used interchangeably.

• None of the above

How can you check the data type of a variable in JavaScript?

• typeof variableName

• checkType(variableName)

• getType(variableName)

• typeof(variableName)