Collection#find method

[DartBot]

This issue was originally filed by @seaneagan

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A method on Collection to find the first of it's elements which matches a predicate would be useful:

E find(bool predicate(E item)) {
  var filtered = filter(predicate);
  if(filtered.isEmpty) return null; // throw instead ?
  return filtered.iterator().next();
};

it might also make sense to rename Collection#filter to Collection#findAll since "filter" seems to have a mutative connotation.

[lrhn]

A find should definitely be there. I'd prefer to call it "findFirst", since it's less ambiguous.
Good point about "filter"/"findAll".

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Set owner to @lrhn.
Added Accepted label.

[lrhn]

Added Area-Library label.

[sethladd]

Added this to the Later milestone.

[kevmoo]

I like the .NET model w/ an extension method E first([bool predicate(E item)])

w/out optional argument, just returns the first element
w/ argument, uses the predicate

Doesn't align w/ 'first' as a property, though.

I'd like to see this in Iterable, not just Collection

[lrhn]

There is now an Iterable.firstWhere doing exactly this (and a lastWhere too!)

[lrhn]

Added Fixed label.