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What is the correct answer?

4

In the following switch syntax, the expression is compared with the case labels using which of the following operator(s)?
switch(expression)
{
statements
}

A. ==

B. equals

C. equal

D. ===

Correct Answer :

D. ===


Explanation: A strict comparison (e.g., ===) is only true if the operands are of the same type and the contents match. When a switch executes, it computes the value of the expression and then looks for a case label whose expression evaluates to the same value (where sameness is determined by the === operator).

Related Questions

What is the correct answer?

4

What will be the output of the following Javascript code?
var a= 0;
var b = 0;
while (a < 3)
{
a++;
b += a;
console.log(b);
}

A. 135

B. 123

C. 013

D. 01

What is the correct answer?

4

Among the keywords below, which one is not a statement?

A. debugger

B. with

C. if

D. use strict

What is the correct answer?

4

What will be the output of the following JavaScript code?
var grade='A';
var result;
switch(grade)
{
case 'A':
result+=10;
case 'B':
result+= 9;
case 'C':
result+= 8;
default:
result+= 0;
}
document.write(result);

A. 10

B. 27

C. 8

D. 0

What is the correct answer?

4

What will be the output of the following JavaScript code?
var values=[1,2,3,4]
var ans=values.slice(1);
document.writeln(ans);

A. 1, 2, 3, 4

B. 2, 3, 4

C. 1, 3, 4

D. error

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4

What will be the output of the following JavaScript code?
const obj1 = { property1: '10'};
const obj2 = Object.freeze(obj1);
obj2.property1 = '20';
console.log(obj2.property1);

A. 10

B. 20

C. Runtime error

D. Compilation error

What is the correct answer?

4

What will be the output of the following JavaScript code?
var grade='A';
var result;
switch(grade)
{
case 'A':
result+=10;
case 'B':
result+= 9;
case 'C':
result+= 8;
default:
result+= 0;
}
document.write(result);

A. 10

B. 27

C. 8

D. 0

What is the correct answer?

4

One of the special feature of an interpreter in reference with the for loop is that ___________

A. Before each iteration, the interpreter evaluates the variable expression and assigns the name of the property

B. The iterations can be infinite when an interpreter is used

C. The body of the loop is executed only once

D. the iteration is finite when an interpreter is used

What is the correct answer?

4

A JavaScript program developed on a Unix Machine ________

A. will throw errors and exceptions

B. must be restricted to a Unix Machine only

C. will work perfectly well on a Windows Machine

D. will be displayed as a JavaScript text on the browser

What is the correct answer?

4

When an empty statement is encountered, a JavaScript interpreter __________

A. Ignores the statement

B. Prompts to complete the statement

C. Throws an error

D. Shows a warning

What is the correct answer?

4

The property of a primary expression is ____________

A. stand-alone expressions

B. basic expressions containing all necessary functions

C. contains variable references alone

D. contains only keywords

What is the correct answer?

4

What will the following code snippet work? If not, what will be the error?
function tail(o)
{
for (; o.next; o = o.next) ;
return o;
}

A. No, this will throw an exception as only numerics can be used in a for loop

B. No, this will not iterate

C. Yes, this will work

D. No, this will result in a runtime error with the message Cannot use Linked List

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4

What will be the equivalent output of the following JavaScript code snippet?
x = ~-y;
w = x = y = z;
q = a?b:c?d:e?f:g;

A.

x = ~(-y); w = (x = (y = z));
q = a?b:(c?d:(e?f:g));

B.

x = a?b:(c?d:(e?f:g));
q = ~(-y); w = (x = (y = z));

C.

x = (x = (y = z));w = ~(-y);
q = a?b:(c?d:(e?f:g));

D.

x = ~(-y); w = (x = (y = z));
q = (c?d:(e?f:g));

What is the correct answer?

4

When an empty statement is encountered, a JavaScript interpreter __________

A. Ignores the statement

B. Prompts to complete the statement

C. Throws an error

D. Shows a warning

What is the correct answer?

4

Which of the following Attribute is used to include External JS code inside your HTML Document?

A. src

B. ext

C. script

D. link

What is the correct answer?

4

JavaScript can be written __________

A. directly into JS file and included into HTML

B. directly on the server page

C. directly into HTML pages

D. directly into the css file

What is the correct answer?

4

What will be the output of the following JavaScript code?
var val1=[1,2,3];
var val2=[6,7,8];
var result=val1.concat(val2);
document.writeln(result);

A. 1, 2, 3

B. Error

C. 1, 2, 3, 6, 7, 8

D. 123

What is the correct answer?

4

Assume that we have to convert false that is a non-string to string. The command that we use is (without invoking the new operator).

A. false.toString()

B. String(false)

C. String newvariable=false

D. Both false.toString() and String(false)

What is the correct answer?

4

What will be the output of the following JavaScript code?
var grade='B';
var result;
switch(grade)
{
case 'A':
{
result+=10;
break;
}
case 'B':
{
result+= 9;
break;
}
case 'C':
{
result+= 8;
break;
}
default:
result+= 0;
}
document.write(result);

A. 10

B. 9

C. 8

D. 0

What is the correct answer?

4

The statement a===b refers to _________

A. Both a and b are equal in value, type and reference address

B. Both a and b are equal in value

C. Both a and b are equal in value and type

D. There is no such statement

What is the correct answer?

4

What will be the output of the following JavaScript code?
const object1 = {
property1: 20
};
console.log(Object.is(object1));

A. 20

B. true

C. false

D. error

What is the correct answer?

4

What will be the output of the following JavaScript code?
function output(option)
{
return (option ? yes : no);
}
bool ans=true;
console.log(output(ans));

A. Yes

B. No

C. Runtime error

D. Compilation error

What is the correct answer?

4

A proper scripting language is a __________

A. High level programming language

B. Assembly level programming language

C. Machine level programming language

D. Low level programming language

What is the correct answer?

4

What kind of expression is new Point(2,3)?

A. Primary Expression

B. Object Creation Expression

C. Invocation Expression

D. Constructor Calling Expression

What is the correct answer?

4

The var and function are __________

A. Keywords

B. Declaration statements

C. Data types

D. Prototypes

What is the correct answer?

4

What will be the output of the following Javascript code?
<script>
document.getElementById("demo").innerHTML = typeof "John"
</script>


A. integer

B. number

C. string

D. error

What is the correct answer?

4

What will be the output of the following Javascript code?
var a = 10;
do {
a += 1;
console.log(a);
} while (a < 5);

A. 11121314

B. 1112

C. 12345

D. 11

What is the correct answer?

4

What will be the output of the following JavaScript code?
function printprops(o)
{
for(var p in o)
console.log(p + : + o[p] +
);
}

A. Prints the contents of each property of o

B. Returns undefined

C. Prints only one property

D. Prints the address of elements

What is the correct answer?

4

The snippet that has to be used to check if a is not equal to null is _________

A. if(a!=null)

B. if (!a)

C. if(a!null)

D. if(a!==null)

What is the correct answer?

4

The method or operator used to identify the array is __________

A. isarrayType()

B. ==

C. ===

D. typeof

What is the correct answer?

4

A function definition expression can be called as __________

A. Function prototype

B. Function literal

C. Function calling

D. Function declaration