Re: Not a big deal, but is the emit function really necessary?

[Jan Lehnardt]

On Oct 14, 2008, at 11:36 , John Beppu wrote:
While working on a map function, it occurred to me that instead of  
emit(key,
doc) what if I could just return [ [key, doc], ... ].

Again, not a big deal.  I just thought it would be more concise.

I think it makes for cleaner code when there are explicit calls to  
`emit()`
instead of having to build up a magic data structure that later can get
returned.

function(doc) {
  if(!doc.stuff) { return; }
  for(var idx in doc.stuff) {
    emit(doc.stuff, 1);
  }
}

vs.

function(doc) {
  if(!doc.stuff) { return; }
  var return_val = []
  for(var idx in doc.stuff) {
    return_val.push([doc.stuff[idx], 1]);
  }
  return return_val;
}

`emit()` is nothing but an alias to Array.push() internally:

emit = function(key, value) {
  map_results.push([key, value]);
}

(from share/server/main.js)

Cheers
Jan
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