Solved

Why add + "" to end of  Math.random?

Posted on 2016-11-04
8
40 Views
Last Modified: 2016-11-05
I have no idea why the empty quotes were added to the end ?
                var axel = Math.random() + "",
                

Open in new window

Does anyone know why someone would do this?

Thanks
0
Comment
Question by:894359
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
  • 2
  • +1
8 Comments
 
LVL 28

Expert Comment

by:Pawan Kumar
ID: 41875084
I dont think it is required. Remove and run the program again and see if you get any difference or issues?

It returns a A floating-point, pseudo-random number between 0 (inclusive) and 1 (exclusive).

Lot of examples are given @ - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random
0
 

Author Comment

by:894359
ID: 41875123
I agree it is not require and removing it has no impact but I was wondering if there was some unknown reason for it?
0
 
LVL 28

Expert Comment

by:Pawan Kumar
ID: 41875132
I must be a developer's mistake - i think unintentionally. :)
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 83

Accepted Solution

by:
Dave Baldwin earned 250 total points
ID: 41875148
It may be there to make sure the variable 'axel' is a string.  Since JavaScript sometimes does automatic conversions, some times you need to do something to make sure you get the type you want.
1
 
LVL 82

Assisted Solution

by:hielo
hielo earned 125 total points
ID: 41875150
Adding + "" at the end of the above statement essentially "casts" the random number to a string (as opposed to a number).  So, after the line you posted, if you were to write:
alert( typeof(axel) );

Open in new window

it should display string.  On the other hand, if you get rid of the + "", then the type would be reported as number.  Perhaps there was a reason why the original developer needed/wanted the random number as a string.
1
 
LVL 28

Assisted Solution

by:Pawan Kumar
Pawan Kumar earned 125 total points
ID: 41875153
Yes below methods can be used to convert a number to a string in JavaScript -
Pawan = Pawan+''      <<Implicit Conversion>>
Pawan = Pawan.toString()  <<Explicit Conversion>>

Although I don't like the first one since once the new developer comes it becomes difficult for him to understand the code.

Explicit conversion should always be used.
0
 

Author Closing Comment

by:894359
ID: 41875749
Thank you all!
0
 
LVL 83

Expert Comment

by:Dave Baldwin
ID: 41875764
You're welcome!
0

Featured Post

Secure Your Active Directory - April 20, 2017

Active Directory plays a critical role in your company’s IT infrastructure and keeping it secure in today’s hacker-infested world is a must.
Microsoft published 300+ pages of guidance, but who has the time, money, and resources to implement? Register now to find an easier way.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In my daily work (mainly using ASP.net), I need to write a lot of JavaScript code. One of the most repetitive tasks I do are the jQuery Ajax calls. You know: (CODE) I don't know if for you it's the same, but for me is soooo tedious to write the …
This article discusses how to create an extensible mechanism for linked drop downs.
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)
The viewer will learn the basics of jQuery including how to code hide show and toggles. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery…

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question