Javascript is a widely used front-end scripting language and we have listed some of the common, javascript multiple choice questions with answers for you here, which can be good for practicing before going for an interview.
Storing numbers, dates, string, or other values
stores string only
allows to store number only
None of the above
Storing numbers, dates, string, or other values
named function
anonymous function
A and B, both are correct
None of the above
A and B, both are correct
Live wire JavaScript
Live wire JavaScript is also called server-side JavaScript. LiveWire is an application development environment that uses JavaScript for creating server-based applications and Therefore it is called as server-side JavaScript.
Microsoft
Native
None of the above
Live wire JavaScript
Live wire JavaScript is also called server-side JavaScript. LiveWire is an application development environment that uses JavaScript for creating server-based applications and Therefore it is called as server-side JavaScript.
only with external scripts
with internal and external scripts
whether there is javascript or not
The tag <noscript>
defines alternate content for users who have scripting disabled in their browser or whose browser does not support scripting.
only in browsers that don’t know what javascript is.
whether there is javascript or not
The tag <noscript>
defines alternate content for users who have scripting disabled in their browser or whose browser does not support scripting.
decrements the total length by 1
increments the total length by 1
just print last element of array
none of the above
decrements the total length by 1
Reverses and stores in the same array
Reverses and concatenates the elements of the array
Reverses
none of the above
Reverses and stores in the same array
true, false, true
false, false, true
true, false, false
new Number()
is a built-in function constructor, so it returns object.
When we use the == operator, it only checks whether it has the same value.
They both have the value of 3, so it returns true.
However, when we use the === operator, both value and type should be the same.
So, the remaining code check, returns false.
false, true, true
true, false, false
new Number()
is a built-in function constructor, so it returns object.
When we use the == operator, it only checks whether it has the same value.
They both have the value of 3, so it returns true.
However, when we use the === operator, both value and type should be the same.
So, the remaining code check, returns false.
44
Since, we are concating string "4" so instead of adding the value, it joins them as a string
8
4
Error
44
Since, we are concating string "4" so instead of adding the value, it joins them as a string
Target -> Bubbling -> Capturing
Capturing -> Target -> Bubbling
Target -> Capturing -> Bubbling
Capturing -> Bubbling -> Target
Capturing -> Target -> Bubbling
var txt = new Array(1:"tim",2:"kim",3:"jim")
var txt = new Array:1=("tim")2=("kim")3=("jim")
var txt = new Array("tim","kim","jim")
var txt = new Array="tim","kim","jim"
var txt = new Array("tim","kim","jim")
That's it, but we will keep adding more javascript interview questions for beginners and advanced front-end developers.
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