Re: [Proto-Scripty] Returning an array of results from an operation on an array.

2010-09-17 Thread Richard Quadling 
On 17 September 2010 13:26, Jarkko Laine  wrote:
>
> On 17.9.2010, at 15.03, Richard Quadling wrote:
>
>> Hi.
>>
>> How do I do something like this (just an example) ...
>>
>> [1,2,3].each(function(val){return val * val;});
>>
>> such that the result is ...
>>
>> [1,4,9]
>
> [1,2,3].map(function(i){ return i * i }); // 
> http://api.prototypejs.org/language/enumerable/prototype/collect/
>
> Note that invoke is a shorthand for map except that it calls a method for 
> each of the items:
>
> ['hello', 'world'].invoke('toUpperCase'); // 
> http://api.prototypejs.org/language/enumerable/prototype/invoke/
> // -> ['HELLO', 'WORLD']
>
> Cheers,
> //jarkko

.map()

ARGHH!! Wood 4 trees



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Re: [Proto-Scripty] Returning an array of results from an operation on an array.

2010-09-17 Thread Jarkko Laine 

On 17.9.2010, at 15.03, Richard Quadling wrote:

> Hi.
> 
> How do I do something like this (just an example) ...
> 
> [1,2,3].each(function(val){return val * val;});
> 
> such that the result is ...
> 
> [1,4,9]

[1,2,3].map(function(i){ return i * i }); // 
http://api.prototypejs.org/language/enumerable/prototype/collect/

Note that invoke is a shorthand for map except that it calls a method for each 
of the items:

['hello', 'world'].invoke('toUpperCase'); // 
http://api.prototypejs.org/language/enumerable/prototype/invoke/
// -> ['HELLO', 'WORLD']

Cheers,
//jarkko

--
Jarkko Laine
http://jlaine.net
http://dotherightthing.com
http://odesign.fi

Check out my latest book, Unobtrusive Prototype, fresh off the Peepcode oven:
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