how to order an array by a particular rule or a function?

[_andrea.l]

I'd like to roder an array:
$array[id][name]
$array[id][number]
$array[id][value]

I'd like to order $array by name or by numbre of by a
function($array[id1],$array[id2]) that return 1 or -1 if id1 is less tha
id2 or viceversa...
How can I do that?
How can I order in a complex case like this?
Thank you in advance,
Andrea.

[Richard Cornford]

Re: how to order an array by a particular rule or a function?

_andrea.l wrote:[color=blue]
> I'd like to roder an array:
> $array[id][name]
> $array[id][number]
> $array[id][value][/color]

Is this an array? How is it created, and its values assigned?
[color=blue]
> I'd like to order $array by name or by numbre of by a
> function($array[id1],$array[id2]) that return 1 or -1
> if id1 is less tha id2 or viceversa...[/color]

What are id1 and id2, and in what sense do they have magnitudes?
[color=blue]
> How can I do that?[/color]

You have not provided sufficient information to have that question
answered.
[color=blue]
> How can I order in a complex case like this?[/color]
<snip>

Nothing presented so far suggest a complex case here.

Richard.

[Lasse Reichstein Nielsen]

Re: how to order an array by a particular rule or a function?

"_andrea.l" <andrea.lorizAN TISPAM@libero.i t> writes:
[color=blue]
> I'd like to roder an array:
> $array[id][name]
> $array[id][number]
> $array[id][value]
>
> I'd like to order $array by name or by numbre of by a
> function($array[id1],$array[id2]) that return 1 or -1 if id1 is less tha
> id2 or viceversa...[/color]

I assume "$array" is an array, and "id" refers to number indices.

Then you can sort using the "sort" method of arrays, which takes an
optional comparison function:
---
function cmpName(v1,v2) {
if (v1.name < v2.name) { return -1; }
else if (v1.name > v2.name) { return 1; }
else {return 0;}
}

$array.sort(cmp Name); // now sorted by name
---

More generally, you can use these functions:
---
/* Compares anything that is recognized by "<" */
function cmp(v1,v2){
return (v2<v1)-(v1<v2); // tricky code, but it works
}

/* creates a function that compares objects by ther "propName" property */
function cmpProperty(pro pName) {
return function(v1,v2) {
return cmp(v1[propName],v2[propName]);
}
}

$array.sort(cmp Property("name" )); // sorted by name property
$array.sort(cmp Property("numbe r")); // sorted by number property
---

/L
--
Lasse Reichstein Nielsen - lrn@hotpop.com
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