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Why add + "" to end of  Math.random?

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

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Does anyone know why someone would do this?

Thanks
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Question by:894359
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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
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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?
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by:Pawan Kumar
ID: 41875132
I must be a developer's mistake - i think unintentionally. :)
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Accepted Solution

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Dave Baldwin earned 1000 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.
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Assisted Solution

by:hielo
hielo earned 500 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) );

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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.
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Assisted Solution

by:Pawan Kumar
Pawan Kumar earned 500 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.
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Author Closing Comment

by:894359
ID: 41875749
Thank you all!
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Expert Comment

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