Add Set equivalents for valid Array methods

NSArray+inject.m

@@ -4,7 +4,7 @@ @implementation NSArray (YOLOInject)
 
 - (id(^)(id, id (^)(id, id)))inject {
     return ^(id initial_memo, id (^block)(id, id)) {
-        BOOL wasNonMutable = [initial_memo classForCoder] == [NSArray class] || [initial_memo classForCoder] == [NSDictionary class];
+        BOOL wasNonMutable = [initial_memo classForCoder] == [NSArray class] || [initial_memo classForCoder] == [NSDictionary class] || [initial_memo classForCoder] == [NSSet class];
         if (wasNonMutable)
             initial_memo = [initial_memo mutableCopy];
 

NSSet+all.h

@@ -0,0 +1,29 @@
+#import <Foundation/NSSet.h>
+
+
+@interface NSSet (YOLOAll)
+
+/**
+ Invokes the given block for each element in the receiver. Should the
+ block return `NO`, the method immediately returns `NO`, ceasing
+ enumeration. If all executions of the block return `YES`, `all`
+ returns `YES`.
+
+    BOOL rv = @[@1, @2, @3].all(^(id o){
+        return [o intValue] > 0;
+    });
+    // rv => YES
+
+    BOOL rv = @[@1, @2, @3].all(^(int d){
+        return d < 3;
+    });
+    // rv => NO
+
+ Instead of a block, you can pass a `Class` object.
+
+    BOOL rv = @[@1, @2, @3].all(NSNumber.class);
+    // rv => YES
+*/
+- (BOOL(^)(id blockOrClass))all;
+
+@end

NSSet+all.m

@@ -0,0 +1,43 @@
+#import "YOLO.ph"
+
+
+@implementation NSSet (YOLOAll)
+
+- (BOOL(^)(id o))all {
+    return ^(id arg){
+        BOOL (^block)(id o) = nil;
+
+        if (arg == NSString.class /*or segfaults!*/ || YOLOIsClass(arg)) {
+            Class cls = arg;
+            block = ^(id o){
+                return [o isKindOfClass:cls];
+            };
+        } else {
+            switch ([YOLOMS(arg) getArgumentTypeAtIndex:1][0]) {
+                case 'c': { block = ^(id o){ return ((BOOL(^)(char))arg)([o charValue]); }; break; }
+                case 'i': { block = ^(id o){ return ((BOOL(^)(int))arg)([o intValue]); }; break; }
+                case 's': { block = ^(id o){ return ((BOOL(^)(short))arg)([o shortValue]); }; break; }
+                case 'l': { block = ^(id o){ return ((BOOL(^)(long))arg)([o longValue]); }; break; }
+                case 'q': { block = ^(id o){ return ((BOOL(^)(long long))arg)([o longLongValue]); }; break; }
+                case 'C': { block = ^(id o){ return ((BOOL(^)(unsigned char))arg)([o unsignedCharValue]); }; break; }
+                case 'I': { block = ^(id o){ return ((BOOL(^)(unsigned))arg)([o unsignedIntValue]); }; break; }
+                case 'S': { block = ^(id o){ return ((BOOL(^)(unsigned short))arg)([o unsignedShortValue]); }; break; }
+                case 'L': { block = ^(id o){ return ((BOOL(^)(unsigned long))arg)([o unsignedLongValue]); }; break; }
+                case 'Q': { block = ^(id o){ return ((BOOL(^)(unsigned long long))arg)([o unsignedLongLongValue]); }; break; }
+                case 'f': { block = ^(id o){ return ((BOOL(^)(float))arg)([o floatValue]); }; break; }
+                case 'd': { block = ^(id o){ return ((BOOL(^)(double))arg)([o doubleValue]); }; break; }
+                case 'B': { block = ^(id o){ return ((BOOL(^)(BOOL))arg)([o boolValue]); }; break; }
+                default:
+                    block = arg;
+                    break;
+            }
+        }
+
+        for (id o in self)
+            if (!block(o))
+                return NO;
+        return YES;
+    };
+}
+
+@end

NSSet+any.h

@@ -0,0 +1,18 @@
+#import <Foundation/NSSet.h>
+
+@interface NSSet (YOLOAny)
+
+/**
+    BOOL rv = @[@1, @2, @3].any(^(id o){
+        return [o intValue] == 3;
+    });
+    // rv => YES
+
+ Instead of a block, you can pass a `Class` object.
+
+    BOOL rv = @[@1, @2, @3].any(NSNumber.class);
+    // rv => YES
+*/
+- (BOOL(^)(id blockOrClass))any;
+
+@end

NSSet+any.m

@@ -0,0 +1,24 @@
+#import "YOLO.ph"
+
+@implementation NSSet (YOLOAny)
+
+- (BOOL(^)(id))any {
+    return ^(id arg){
+        BOOL (^block)(id o) = nil;
+
+        if (arg == NSString.class /*or segfaults!*/ || YOLOIsClass(arg)) {
+            Class cls = arg;
+            block = ^(id o){
+                return [o isKindOfClass:cls];
+            };
+        } else
+            block = arg;
+
+        for (id o in self)
+            if (block(o))
+                return YES;
+        return NO;
+    };
+}
+
+@end

NSSet+find.h

@@ -0,0 +1,17 @@
+#import <Foundation/NSSet.h>
+
+@interface NSSet (YOLOFind)
+
+/**
+ Passes each entry in the array to the given block, returning the first
+ element for which block is not `NO`. If no object matches, returns
+ `nil`.
+
+    id rv = @[@1, @2, @3, @4].find(^(id n){
+        return [n isEqual:@3];
+    });
+    // rv => @3
+*/
+- (id(^)(id))find;
+
+@end

NSSet+find.m

@@ -0,0 +1,14 @@
+#import "YOLO.ph"
+
+@implementation NSSet (YOLOFind)
+
+- (id(^)(id))find {
+    return ^id(BOOL (^block)(id o)) {
+        for (id item in self)
+            if (block(item))
+                return item;
+        return nil;
+    };
+}
+
+@end

NSSet+flatMap.h

@@ -0,0 +1,30 @@
+#import <Foundation/NSSet.h>
+
+@interface NSSet (YOLOFlatMap)
+
+/**
+ Returns a new set with the concatenated results of running block once
+ for every element in the receiver.
+
+    id rv = @[@1, @2, @3, @4].flatMap(^(id n){
+        return @[n, n];
+    });
+    // rv => @[@1, @1, @2, @2, @3, @3, @4, @4]
+
+    id rv = @[@1, @2, @3, @4].flatMap(^(id n){
+        return [NSSet setWithArray:@[n, n]];
+    });
+    // rv => @[@1, @1, @2, @2, @3, @3, @4, @4]
+ 
+    id rv = @[@1, @2, @3, @4].flatMap(^(id n){
+        return @[n, @[n]];
+    });
+    // rv => @[@1, @[@1], @2, @[@2], @3, @[@3], @4, @[@4]]
+
+ PROTIP: Useful over vanilla map followed by a flatten because flatten is
+ recursive, and you may want to preserve array relationships beyond the
+ first level. Also, `flatMap` is technically more efficient.
+*/
+- (id(^)(NSSet *(^)(id o)))flatMap;
+
+@end

NSSet+flatMap.m

@@ -0,0 +1,19 @@
+#import "YOLO.ph"
+
+@implementation NSSet (YOLOFlatMap)
+
+- (NSSet *(^)(NSSet *(^)(id o)))flatMap {
+    return ^(NSSet *(^block)(id o)){
+        NSMutableSet *rv = [NSMutableSet new];
+        for (id o in self) {
+            id m = block(o);
+            if ([m isKindOfClass:[NSSet class]])
+                [rv addObjectsFromArray:[m allObjects]];
+            else
+              [rv addObjectsFromArray:m];
+        }
+        return rv;
+    };
+}
+
+@end

NSSet+flatten.h

@@ -0,0 +1,14 @@
+#import <Foundation/NSSet.h>
+
+@interface NSSet (YOLOFlatten)
+
+/**
+ Returns a new, one-dimensional array that is a recursive flattening of
+ the receiver.
+
+    id rv = @[@[@1, @[@2]], @3, @[@4]].flatten
+    // rv => @[@1, @2, @3, @4]
+*/
+- (NSSet *)flatten;
+
+@end

NSSet+flatten.m

@@ -0,0 +1,18 @@
+#import "YOLO.ph"
+
+@implementation NSSet (YOLOFlatten)
+
+- (id)flatten {
+    NSMutableSet *aa = [NSMutableSet set];
+    for (id o in self) {
+        if ([o isKindOfClass:[NSArray class]])
+            [aa addObjectsFromArray:[o flatten]];
+        else if ([o isKindOfClass:[NSSet class]])
+            [aa addObjectsFromArray:[o allObjects]];
+        else
+            [aa addObject:o];
+    }
+    return aa;
+}
+
+@end

NSSet+groupBy.h

@@ -0,0 +1,15 @@
+#import <Foundation/NSSet.h>
+
+@interface NSSet (YOLOGroupBy)
+
+/**
+ Groups the collection by result of the given block.
+
+    id rv = @[@1, @2, @3, @4].groupBy(^(NSNumber *n) {
+        return @(n.intValue % 2);
+    });
+    // rv => @{@0: @[@1, @3], @1: @[@2, @4]}
+*/
+- (NSDictionary *(^)(id (^)(id o)))groupBy;
+
+@end

NSSet+groupBy.m

@@ -0,0 +1,19 @@
+#import "YOLO.ph"
+
+@implementation NSSet (YOLOGroupBy)
+
+- (NSDictionary *(^)(id (^)(id o)))groupBy {
+    return ^id(id (^block)(id)) {
+        NSMutableDictionary *dict = [NSMutableDictionary new];
+        for (id o in self) {
+            id key = block(o);
+            if (!dict[key])
+                dict[key] = [NSMutableArray arrayWithObject:o];
+            else
+                [dict[key] addObject:o];
+        }
+        return dict;
+    };
+}
+
+@end

NSSet+has.h

@@ -0,0 +1,24 @@
+#import <Foundation/NSArray.h>
+
+@interface NSSet (YOLOHas)
+
+/**
+    BOOL rv = @[@1, @2, @3].has(@2)
+    // rv => YES
+
+Short-hand for containsObject:. Provided because doing a map, then a
+select and a few more chained dot-notations are commonly followed with
+the need to then determine if a particular value is in the resulting
+array, and then having to square bracket the whole chain is ugly.
+
+We decided not to override any or find with the capability to take an
+object rather than a block and instead add this method. Rest assured the
+decision was careful. In the end has() seemed the choice that resulted in
+the clearest code.
+
+`has` was chosen over *contains* or *includes* because it is short and
+clear.
+*/
+- (BOOL (^)(id o))has;
+
+@end

NSSet+has.m

@@ -0,0 +1,11 @@
+#import "YOLO.ph"
+
+@implementation NSSet (YOLOHas)
+
+- (BOOL (^)(id o))has {
+    return ^BOOL(id o){
+        return [self containsObject:o];
+    };
+}
+
+@end

NSSet+inject.h

@@ -0,0 +1,21 @@
+#import <Foundation/NSSet.h>
+
+@interface NSSet (YOLOInject)
+
+/**
+ Combines all elements of the receiver by applying a binary operation.
+
+    id rv = @[@1, @2, @3, @4].inject(@{}, ^(NSMutableDictionary *memo, NSNumber *n){
+        memo[n] = @(n.intValue * n.intValue);
+        return memo;
+    });
+    // rv => @{@1: @1, @2: @4, @3: @9, @4: @16}
+
+ PROTIP: If you feed `inject` a non-mutable dictionary or array YOLOKit
+ mutates it for your block, and then finally returns a non-mutable copy.
+
+ @see -reject
+*/
+- (id(^)(id initial_memo, id (^)(id memo, id obj)))inject;
+
+@end

NSSet+inject.m

@@ -0,0 +1,18 @@
+#import "YOLO.ph"
+
+@implementation NSSet (YOLOInject)
+
+- (id(^)(id, id (^)(id, id)))inject {
+    return ^(id initial_memo, id (^block)(id, id)) {
+        BOOL wasNonMutable = [initial_memo classForCoder] == [NSArray class] || [initial_memo classForCoder] == [NSDictionary class] || [initial_memo classForCoder] == [NSSet class];
+        if (wasNonMutable)
+            initial_memo = [initial_memo mutableCopy];
+
+        id memo = initial_memo;
+        for (id obj in self)
+            memo = block(memo, obj);
+        return wasNonMutable ? [memo copy] : memo;
+    };
+}
+
+@end

NSSet+join.h

@@ -0,0 +1,19 @@
+#import <Foundation/NSSet.h>
+
+@interface NSSet (YOLOJoin)
+
+/**
+ Returns a string of all the receiver’s elements joined with the provided
+ separator string.
+
+    id rv = @[@1, @2, @3, @4].join(@",");
+    // rv => @"1,2,3,4"
+
+    id rv = @[@1, @2, @3, @4].join(@"");
+    // rv => @"1234"
+
+ PROTIP: `-description` is called on all objects before joining them.
+*/
+- (NSString *(^)(NSString *))join;
+
+@end

NSSet+join.m

@@ -0,0 +1,12 @@
+#import "NSSet+pluck.h"
+#import "YOLO.ph"
+
+@implementation NSSet (YOLOJoin)
+
+- (NSString *(^)(NSString *))join {
+    return ^(NSString *separator) {
+        return [self.pluck(@"description").allObjects componentsJoinedByString:separator ?: @""];
+    };
+}
+
+@end