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Set some elements of an array

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  Set some elements of an array Archos <raul.san@sent.com> - 2012-01-25 14:05 -0800
    Re: Set some elements of an array "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2012-01-25 16:30 -0800
    Re: Set some elements of an array Gene Wirchenko <genew@ocis.net> - 2012-01-25 15:54 -0800
      Re: Set some elements of an array "Evertjan." <exjxw.hannivoort@interxnl.net> - 2012-01-27 09:16 +0000
      Re: Set some elements of an array Dr J R Stockton <reply1204@merlyn.demon.co.uk> - 2012-01-27 20:39 +0000

#10582 — Set some elements of an array

I want to initialize an array of 16 elemts to 0

    var b1 = []; for (var i=0; i<16; i++){ b1[i]=0; }

But, then, I want that the 4 first elements have a value, so I tried
this one:

    b1 = [1, 2, 3, 4 , b1[4:16]]

althought it doesn't works. How to get it?
Thanks in advance

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#10587

On Jan 25, 4:05 pm, Archos <raul....@sent.com> wrote:
> I want to initialize an array of 16 elemts to 0
>
>     var b1 = []; for (var i=0; i<16; i++){ b1[i]=0; }
>
> But, then, I want that the 4 first elements have a value, so I tried
> this one:
>
>     b1 = [1, 2, 3, 4 , b1[4:16]]
>
> althought it doesn't works. How to get it?
> Thanks in advance

JavaScript doesn't use slice syntax. It was proposed at some point,
but never followed up on AFAIK.

b1 = [1,2,3,4].concat(b1.slice(4))

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#10610

On Wed, 25 Jan 2012 14:05:07 -0800 (PST), Archos <raul.san@sent.com>
wrote:

>I want to initialize an array of 16 elemts to 0
>
>    var b1 = []; for (var i=0; i<16; i++){ b1[i]=0; }
>
>But, then, I want that the 4 first elements have a value, so I tried
>this one:
>
>    b1 = [1, 2, 3, 4 , b1[4:16]]
>
>althought it doesn't works. How to get it?
>Thanks in advance

     Try

var b1=[1,2,3,4,0,0,0,0,0,0,0,0,0,0,0,0];

or

var b1=[1,2,3,4];
for (var i=4; i<16; i++)
  b1[i]=0;

     Are you thinking that an array is fixed in size at declaration?
It is not.

Sincerely,

Gene Wirchenko

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#10631

Gene Wirchenko wrote on 26 jan 2012 in comp.lang.javascript:

> var b1=[1,2,3,4,0,0,0,0,0,0,0,0,0,0,0,0];
> 
> or
> 
> var b1=[1,2,3,4];
> for (var i=4; i<16; i++)
>   b1[i]=0;

A variation:

b = [1,2,3,4].concat([0,0,0,0,0,0,0,0,0,0,0,0]);

document.write(b.length + ': ' + b); 
      // 16: 1,2,3,4,0,0,0,0,0,0,0,0,0,0,0,0

====================

If the added content is not all zero but repeating
concat() is a good choice:

var b=[1,2,3,4];
for (var i=4; i<16; i+=2)
   b = b.concat([9,55]);

document.write(b.length + ': ' + b); 
       // 16: 1,2,3,4,9,55,9,55,9,55,9,55,9,55,9,55


-- 
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

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#10658

In comp.lang.javascript message <1u41i7ttl9evaofuq75ffktd4c9lracvbg@4ax.
com>, Wed, 25 Jan 2012 15:54:35, Gene Wirchenko <genew@ocis.net> posted:

>     Try
>
>var b1=[1,2,3,4,0,0,0,0,0,0,0,0,0,0,0,0];
>
>or
>
>var b1=[1,2,3,4];
>for (var i=4; i<16; i++)
>  b1[i]=0;

     Try

var b1=[1,2,3,4,0,0,0,0,0,0,0,0,0,0,0,0];

or

var b1=[], i=0
do { b1[i] = ++i * (i<5) } while (i < 16)


NOTE - it is well to avoid i & l & o & O for variable identifiers in
News articles, since you know nothing about the monitors, fonts,
spelling-checkers, and eyeballs that your avid readers are using.

-- 
 (c) John Stockton, nr London, UK.    ?@merlyn.demon.co.uk     Turnpike v6.05.
 Website  <http://www.merlyn.demon.co.uk/> - w. FAQish topics, links, acronyms
 PAS EXE etc. : <http://www.merlyn.demon.co.uk/programs/> - see in 00index.htm
 Dates - miscdate.htm estrdate.htm js-dates.htm pas-time.htm critdate.htm etc.

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