Javascript Online Test

1. if(a!=null)

2. if (!a)

3. if(a!null)

4. if(a!==null)

Correct Answer : D

var grade='Z';  
var result;  
switch(grade)  
{  
case'A':  
        result+="10";  
case'B':  
        result+=" 9";  
case'C':  
        result+=" 8";  
default:  
        result+=" 0";  
}  
console.log(result);

1. 10

2. 17

3. 18

4. 0

Correct Answer : D

{ "employee" : { "type" : "Director", "functions" : ['sales', 'marketing'] } }

1. String

2. Object

3. Director

Correct Answer : C

var count =0;  
while (count <10)  
{  
     console.log(count);  
     count++;  
}

1. An error is displayed

2. An exception is thrown

3. The values of the count variable are logged or stored in a particular location or storage

4. The value of count from 0 to 9 is displayed in the console

Correct Answer : C

1. It returns a localised object representation

2. It returns a localized string representation of the object

3. It return a local time in the string format

4. It return a parsed string

Correct Answer : B

((...x, xs)=>x)(1,2,3)

1. 1

2. 3

3. [1,2,3]

4. Error

Correct Answer : D

1. Static

2. Dynamic

Correct Answer : B

1. Math.round(3.12)

2. Math.rnd(3.12)

3. float(3.12)

4. Math.float(3.12)

Correct Answer : A

1. The contents are displayed by non-JS-based browsers.

2. Clears all the cookies and cache.

3. Both A and B

4. None of the above

Correct Answer : A

typeof (new class f() { [f]() { }, f: { } })[`${f}`]

1. "function"

2. "undefined"

3. "object"

4. Error

Correct Answer : D

const values = [10, 20, 30];
const result = values.map(myFunction);

document.write("Result: ", result);

function myFunction(value, index, array) {
  return value * value;
}

1. Result: 10,20,30

2. Result: 10*10,20*20,30*30

3. Result: 100,400,900

4. ValueError

Correct Answer : C

1. Date

2. FileUpload

3. File

4. Function

Correct Answer : C

1. A collection of name/value pairs, and an ordered list of values, or array.

2. A collection of object/item pairs, and an ordered list of pairs, or array.

3. A collection of name/value objects, and an ordered list of objects, or array.

4. A collection of native-value pairs, and an ordered list of arrays, or values.

Correct Answer : A

var str = "40";  
var num =50; 

console.log(str + num);

1. 4050

2. 90

3. 40

4. Error

Correct Answer : A

1. // var x = 0; // var y = 0;

    

2. /* var x = 0; // var y = 0; */

    

3. /* var x = 0; */ var y = 0;

    

4. // var x = 0; /* var y = 0; */

    

Correct Answer : C

1. while (i <= 10)

2. while (i <= 10; i++)

3. while i = 1 to 10

4. None of These

Correct Answer : A

console.log( typeof( '5' + 5))

1. number

2. string

3. object

4. null

Correct Answer : B

var a = 10;
var b = 0;
document.write(a/b);

1. Nothing is printed

2. 0 is printed

3. Infinity is printed

4. Some Garbage Value

Correct Answer : C

1. Netscape

2. Bell Labs

3. Sun Microsystems

4. IBM

Correct Answer : A

1. Shows a warning

2. Prompts to complete the statement

3. Throws an error

4. Ignores the statements

Correct Answer : D

1. Contains only keywords

2. basic expressions containing all necessary functions

3. contains variable references alone

4. stand-alone expressions

Correct Answer : D

1. Property Access Expression

2. Functional expression

3. Invocation expression

4. Primary expression

Correct Answer : C

1. onfinished

2. onload

3. onunload

4. oncomplete

Correct Answer : B

1. 0

2. undefined

3. null

4. NaN

Correct Answer : B

1. Both the datatype and the result of the expression are compared.

2. Only the datatype of the expression is compared.

3. Only the value of the expression is compared.

4. None of the above

Correct Answer : A

1. inject and fold

2. filter and fold

3. finger and fold

4. fold

Correct Answer : A

1. \\

2. //

3. \* *\

4. \* */

Correct Answer : B

1. getYear()

2. fullYear()

3. getFullYear()

4. getfullyear()

Correct Answer : C

let x = 10; 
document.write(typeof x, " , ", typeof String(x));

1. number, string

2. number, number

3. object, string

4. object, object

Correct Answer : A

1. Increase end-user satisfaction

2. Increase the validity of form submission

3. Conservation of bandwidth

4. All the above answers

Correct Answer : D