Hi Robert,

Yesterday, I went looking for an objective-C implementation of underscore and found yours! I have very impressed with the amazing property trick for implementing .functionName syntax.

However, felt the syntax and forced chaining could a little unconventional in the sense that I believe an Underscore.js user would just want something identical as much as possible. So I wrapped your library using the _.function convention, I introduced a convention of _.functionNameC for the library user to choose Chaining, and I added _,indexOf and _.defer because I was using them in my own library.

A few thoughts:

1. As an optimization, I copied some common code to the _.functionName implementation. Obviously having duplicate code is not great, but I wanted to avoid unnecessary collection copying through the Wrappers. Maybe someone in the community can review this for more optimizations (maybe some implementations belong in the Wrappers and some in the _.functionName).

2. I was originally trying to store _ in an extern rather than as a singleton, but couldn't get it to work. If you have any ideas to do that to avoid the extra [Underscore sharedInstance] calls, please do!

3. I ended up removing some of your '- (id)init __deprecated;' for the singleton to create an instance. Hopefully that is the best approach.

I hope you accept this pull request!

Kevin

Just thinking out loud here

Underscore.string(@"It was the best of times, it was the worst of times")
     .downcase
     .strip(@[ @"," ]) 
     .split(@" ")
     .uniq // Array
     .join(@", ")
     .unwrap; // @"it, was, the, best, of, times, worst"

Suppose there was apply for dictionaries

Underscore.dict(data)
    .filterKeys(Underscore.isKeyPath(target))
    .defaults(kDefaultValues)
    .apply(target)

I've done a bit of a tidy. Fixed a failing test and updated the pod spec. Let me know if there's anything else that needs too e done. I'd like to merge soon and then update master shortly thereafter and get cocoa pod updated.

I also updated the pods and project settings to work with the latest Xcode.

@robb Do you think it's worth adding Carthage support?

Say I have this array of dictionaries:

NSArray *names = @[ @{"name" : @"john", "sex" : "male"}, @{"name" : @"alice", "sex" : "female"}, @{"name" : @"mary", "sex" : "female"}];

The command names.group_by(@"sex") will return the array grouped by the sex.

@[ @[@{"name" : @"john", "sex" : "male"}], @[@{"name" : @"alice", "sex" : "female"}, @{"name" : @"mary", "sex" : "female"}]];

I think this may be possible to do right now by chaining, but would be good to have this added to the main methods in Underscore+Functional.h

Hi Robert,

Love the library, as I love underscore.js. Got it working with the CocoaPods installation.

But I gotta ask, how do you install Underscore.m globally with the alias? ie. where do I put:

#import "Underscore.h"
#define Underscore _

I tried -Prefix.pch, which worked in 0.1.0. It doesn't seem to work now. Instead, I get: Pods/Headers/Underscore.m/Underscore.h:34:3: Underscore.m requires Automatic Reference Counting to be enabled

Thanks!

You have the following code in Underscore.h:

#if !__has_feature(objc_arc)
# error Underscore.m requires Automatic Reference Counting to be enabled
#endif

As far as Cocoapods creates project with disabled ARC and -fobjc-arc flags for sources - project can't be builded.

Hi I'm u16suzu, from CA, US.

Thanks for good library. I'm using your library for my private project.

BTW, I want to add these methods on my issues's title. Actually theses are Ruby's methods, not but Underscore.js.

push: add element to tail of array pop: remove element from tail of array

unshift: add element to head of array shift: remove element from head of array

Thanks for read.

(This replaces #24 which was based against master)

@amiel:

I mistakenly changed the test in 864008628a620cb409a0c3220ef809d301db5eee, see the comment there.

The intention of USAssertEqualObjects is to compare functional style methods to their equivalent chaining style. For asserting the expecting results, please use STAssertEqualObjects with an appropriate description.

I think sortAscending should be called compare to better communicate that it will simply call compare: on the passed in objects. Since Objective-C does not have generics, there is no good way to enforce that the objects actually respond to that selector. Let's be at least clear about what's going on behind the scenes.

Regarding sortDescending, I think a reverse helper block would prove to be more flexible. What do you think? I could also live with leaving it out entirely since you really just need to

_.sort(array, ^(id a, id b){ [b compare:a]; }); // Return type inference FTW! 

Hi,

I added some support for 'unique' method on array wrapper.

Here is a sample:

        NSURL *fbReposUrl = [NSURL URLWithString:@"https://api.github.com/orgs/facebook/repos"];
        NSData *data = [NSData dataWithContentsOfURL:fbReposUrl];
        NSArray *repos = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:NULL];

        NSArray *languages = _array(repos).pluck(@"language").reject([Underscore isNull]).unique.unwrap;

        NSLog(@"Unique languages used by FaceBook: %@", languages);

Any reason to prefer wrapper over Category? Using category, we can achieve:

@[a, b, c].map(^(NSString *string) {
    return string.capitalizedString;
})

without any wrapping, right?

AS suggested by @yn in #10

NSArray *array = @[ @1, @2, @3, @2, @4, @1 ];

NSArray *uniques = _.uniq(array); // @[ 1, @2, @3, @4 ]

~~Should probably wait until the feature/functional-style branch went into development…~~

Added method to zip elements passing an array of arrays that returns another array of arrays zipped. This method only works if all the sub-arrays have the same length (should i add some checks here?)

this:

@[@[@1, @2, @3], @[@4, @5, @6], @[@7, @8, @9]]

transforms into this:

@[@[@1, @4, @7], @[@2, @5, @9], @[@3, @6, @9]]

:warning: all the arrays should have the same lenght

I would like to add specs, but can't make the tests run. Always getting this error after pod install:

ld: library not found for -lPods-UnderscoreTests-Expecta
clang: error: linker command failed with exit code 1 (use -v to see invocation)

There are some very useful functions in underscore-contrib that are missing from underscore.js: http://documentcloud.github.io/underscore-contrib/

My plan is to fork Underscore.m and add these methods as I need them, but I wanted to check that you are open to adding functions like these first. Thanks!