Comments on: Cocoa Tutorial: C# LINQ Or Cocoa Key Paths And NSPredicate

By: Nimi Peleg

Nimi Peleg — Fri, 29 Aug 2008 06:59:57 +0000

I think a more appropriate comparison to LINQ should be Core Data, which allows you to match NSPredicate queries against XML, SQLite, or in-memory stores.

By: Jumping Through Hoops – del.icio.us links for 2008-08-27

Jumping Through Hoops – del.icio.us links for 2008-08-27 — Thu, 28 Aug 2008 00:34:00 +0000

[...] Cocoa Is My Girlfriend > Cocoa Tutorial: C# LINQ Or Cocoa Key Paths And NSPredicate – How to achieve LINQ-like filtering in Cocoa [...]

By: Matt Long

Matt Long — Sun, 24 Aug 2008 22:47:29 +0000

@Chris Hanson

Yep. You're right. I've fixed it. Was a typo.

Thanks.

-Matt

By: Microsoft’s LINQ and Apple’s Cocoa Key Paths - Future Steve

Microsoft’s LINQ and Apple’s Cocoa Key Paths - Future Steve — Sun, 24 Aug 2008 15:12:57 +0000

[...] can read more about how Apple’s OS X handles this in Matt Long’s posting over at the interestingly named “Cocoa Is My Girlfriend” blog. Tags: cocoa, key paths, [...]

By: thsutton

thsutton — Sun, 24 Aug 2008 10:11:34 +0000

While LINQ and Cocoa bindings do serve similar purposes, they are quite different from a technology point of view. Whereas LINQ is part of the language with a syntax and a semantics (grounded in some quite interesting theory) that the compiler can and does check, Cocoa bindings are just strings in so far as the language is concerned and are interpreted on an ad-hoc basis by whatever object they happen to get passed to.

Another point about bindings that caused me no little confusion (and a symptom of their ad-hoc interpretation) is that the set and array operators are not supported by all collection classes. Some collections returned by Core Data, in particular and for example, don't seem to support any operators but @count so you wind up doing things like coding up a value transformer to fake it.

I've not yet used NSPredicate, so I won't bother to comment on it.

Finally, a note that I'm a Cocoa and Objective-C beginner so responses highlighting obvious and not-so-obvious errors and misunderstandings would be appreciated.

By: Cocoa Tutorial: C# LINQ Or Cocoa Key Paths And NSPredicate « Recycleosphere

Cocoa Tutorial: C# LINQ Or Cocoa Key Paths And NSPredicate « Recycleosphere — Sun, 24 Aug 2008 06:12:23 +0000

[...] Tutorial: C# LINQ Or Cocoa Key Paths And NSPredicate Cocoa Tutorial: C# LINQ Or Cocoa Key Paths And NSPredicate: “I think it may be helpful to demonstrate how to perform certain tasks in Cocoa from the [...]

By: Chris Hanson

Chris Hanson — Sun, 24 Aug 2008 05:29:01 +0000

Your array-KVC examples are incorrect: Since you’re working with Customer objects, you should be using a key path of @”lastName” and not @”customer.lastName”.