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From: Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups: comp.lang.javascript
Subject: Re: Merge indexes..
Date: Wed, 20 May 2015 11:42:55 +0100
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jonas.thornvall@gmail.com writes:

> Den onsdag 20 maj 2015 kl. 08:59:15 UTC+2 skrev jonas.t...@gmail.com:
>> I need to merge integers at indexes within an array into an integer?
>>  [7,9,8]  = 798
>> 
>> No join i need an integer value.
>> 
>> How?
>
> Sorry i was thinking wrong should be 897, i have one way todo it. But
> i was thinking it should be possible to do with just concatenations
> rather than arithmetic?

That's because you are still not clear about the distinction between a
number and its representation.  If you have Number values (that's an
ECMAScrip type) then arithmetic is the correct way to produce new
numbers like this.

> <script>
> function merge(){
>   for (i=0;i<myArr.length;i++){
>       myInt=(myArr[i]*x)+myInt;
>       x=x*10;
>   }
> }
> myArr =[7,9,8]
> myInt=0;
> x=1;
> merge();
> document.write(myInt);
> </script>

Don't make you code worse by adding yet more function that communicate
via globals.  This operation is a self-contained function of the array.
Pass the array as a parameter and return the result from the function.

-- 
Ben.