JavaScript Quiz | For Beginners

Which of the following is the correct syntax to display “CodeMaster” in an alert box using JavaScript?

• alertbox(“CodeMaster”);

• alert{“CodeMaster”};

• alert(CodeMaster);

• alert(“CodeMaster”);

What is the correct syntax for referring to an external script called “script.js”?

• <script src=”script.js”>

• <script href=”script.js”>

• <script ref=”script.js”>

• <script src=”script.js()”>

Predict the output of the following JavaScript code:

<script type="text/javascript">

a = 8 + "8";

document.write(a);

</script>

• 16

• Compilation Error

• 88

• Run Time Error

Predict the output of the following JavaScript code.

<script type="text/javascript">

var a="GeeksforGeeks";

var x=a.lastIndexOf("G");

document.write(x);

</script>

• 8

• 0

• 9

• Error

Which of the following is not a reserved word in JavaScript?

• interface

• throws

• program

• short

Predict the output of the following JavaScript code:

<script type="text/javascript" language="javascript">

var x=5;

var y=6;

var res=eval("x*y");

document.write(res);

</script>

• “30”

• 30

• 5*6

• “5*6”

Which built-in method returns the character at the specified index?

• characterAt()

• getCharAt()

• charAt()

• None of These

Which of the following function of String object returns a number indicating whether a reference string comes before or after or is the same as the given string in sort order?

• localeCompare()

• search()

• substr()

• concat()

Which of the following function of Array object calls a function for each element in the array?

• concat()

• every()

• filter()

• forEach()

Which of the following function of Array object returns a string representing the array and its elements?

• toSource()

• sort()

• splice()

• toString()