HenningBrandt

@implementation NSArray (GroupBy)

- (NSArray *)groupByKeyPath:(NSString *)keyPath {
    NSArray *distinctValues = [self valueForKeyPath:[@"@distinctUnionOfObjects." stringByAppendingString:keyPath]];
    NSMutableArray *result = [NSMutableArray arrayWithCapacity:[distinctValues count]];
    
    for (id groupValue in distinctValues) {
        NSString *predicateFormat = [NSString stringWithFormat:@"(%@ == %%@)", keyPath];
        NSPredicate *predicate = [NSPredicate predicateWithFormat:predicateFormat, groupValue];
        NSArray *group = [self filteredArrayUsingPredicate:predicate];

HenningBrandt

func foldl1<A>(list: Array<A>, f: (A, A) -> A) -> A {
    return foldl(list.head!, list: list.tail!, f: f)
}

extension Array {
    var initial: Array<Element>? {
        get {
            if self.empty() { return nil }
            return Array(dropLast(self))
        }

HenningBrandt

extension Array {
    func empty() -> Bool {
        return self.count == 0
    }
    
    var head: Element? {
        get {
            return self.first
        }
    }

HenningBrandt

protocol TreeLike {}

enum Tree<T> : TreeLike {
    case Leaf(@autoclosure () -> T)
    case Node(TreeLike, TreeLike)
}

func node<T>(left: Tree<T>, right: Tree<T>) -> Tree<T> {
    return Tree.Node(left, right)
}

HenningBrandt

# Very simple prompt with:
# User, Git information, current working directory
# Special feature (because I love useless stuff) is a random prompt character for each new session
# in the form of a short one line ASCII-Art (Yeah! ASCII-Art)
#
# Some ASCII-Art might be NSFW, so be aware if you you use this prompt in public ;)
#
# Source of ASCII-Art: http://1lineart.kulaone.com 
#
# Author: Henning Brandt

HenningBrandt

#!/usr/bin/env ruby

# Simple script to scrape for one line ASCII-Art and filter them by character-type and length.
# It than constructs a shell-script array and ouputs it to the file argument.
#
# Author: Henning Brandt
# Created: 04.01.15
# Licence: MIT
#