Mapi function

Discussion:

Mapi function

Rupert Bates

2009-05-19 09:19:37 UTC

Hi there, how about adding a mapi function to Mochikit.Iter which
passes the index of the item being processed to the specified
function? It would be really handy, for instance for specifying
altenate rows on a table.
Rupert

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Morten Barklund

2009-05-19 13:38:24 UTC

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Hi Rupert,

You can do that using the MochiKit.Base.items() function:

var foo=[{b:1},{b:2},{b:3}];
var indexed_foo = items(foo); // an array like
[[0,{b:1}],[1,{b:2}],[2,{b:3}]];

Then you can map over this using arg[0] and arg[1] as index and value
respectively.

:)

Regards,
B

Post by Rupert Bates
Hi there, how about adding a mapi function to Mochikit.Iter which
passes the index of the item being processed to the specified
function? It would be really handy, for instance for specifying
altenate rows on a table.
Rupert

--
Morten Barklund

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Bob Ippolito

2009-05-19 15:13:09 UTC

Permalink

Typically this is done with count or cycle and izip.

izip(cycle(["odd", "even"]), someArray)

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Rupert Bates

2009-05-20 14:32:27 UTC

Permalink

Thanks for the reply, so that answers the alternate rows case, but
there are plenty of other cases where you would want to know the index
of the item. The items() solution feels like a bit of a workaround and
presumably has performance implications. Would a mapi function not be
more efficient and elegant? Sorry if I'm missing something.
Rupert

Post by Bob Ippolito
Typically this is done with count or cycle and izip.
izip(cycle(["odd", "even"]), someArray)

Bob Ippolito

2009-05-20 15:53:13 UTC

Permalink

Did you read the sentence that I wrote?

izip(count(), someArray) does the indexes.

Post by Rupert Bates
Thanks for the reply, so that answers the alternate rows case, but
there are plenty of other cases where you would want to know the index
of the item. The items() solution feels like a bit of a workaround and
presumably has performance implications. Would a mapi function not be
more efficient and elegant? Sorry if I'm missing something.
Rupert

Post by Bob Ippolito
Typically this is done with count or cycle and izip.
izip(cycle(["odd", "even"]), someArray)