Question

Which one of the following codes is correct for concatenating the strings passed into the function?

A. Code 1

functionconcatenate()  

{  

returnString.prototype.concat('', arguments);  

}  

B. Code 2

functionconcatenate()  

{  

returnString.prototype.concat.apply('', arguments);  

}  

C. Code 3

functionconcatenate()  

{  

returnString.prototype.apply('', arguments);  

}  

D. Code 4

functionconcatenate()  

{  

returnString.concat.apply('', arguments);  

}  

Answer 1

Answer: B

Reason: The "concat()" method is a predefined method of the JavaScript which is used for joining the two or more arrays. The significant advantage of using this method is instead of making changes in the existing array it returns a newly created array. The ".apply" method is also predefined method just like the" concat()", and it takes arrays of arguments and consider the every element of that array as an individual argument.