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// Check name validity
RACSignal *nameValid = [RACAbleWithStart(self.name) map:^(NSString *name) {
    return @(name.length > 0);
}];

RACSignal *nameValidationMessage = [nameValid map:^ id (NSNumber *valid) {
    return valid.boolValue ? nil : @"Please enter a name that matches our bullshit rules";
}];

// Check email validity

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@interface TXLocation : MTLModel <MTLJSONSerializing>

@property (strong, nonatomic, readonly) NSString *status;
@property (strong, nonatomic, readonly) NSNumber *sector;
@property (strong, nonatomic, readonly) NSString *macAddress;
@property (strong, nonatomic, readonly) NSNumber *facilityId;
@property (strong, nonatomic, readonly) NSNumber *departmentId;

@property (strong, nonatomic, readonly) NSNumber *mapId;
@property (strong, nonatomic, readonly) NSNumber *mapVersion;

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#!/usr/bin/python

import Image
import base64, zlib

# Jay Parlar convinced me to turn this data structure
# from a dictionary into an object. 
class PackedImage(object):
  def __init__(self, mode, size, data):
    self.mode = mode

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//
//  UIImageCreateUsingBlock.m
//
//  Copyright (c) 2013 Zachary Waldowski.
//  Licensed under MIT - Provided as-is.
//

#import <UIKit/UIKit.h>
#import <CoreGraphics/CoreGraphics.h>

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// Creating a lambda in C++ with variable type inferred automatically
auto someLambda = [](float w, int x, int y) { return(x); };

// Creating a block in C/ObjC without the use of a typedef -- UGLY
int (^someBlock)(float, int, int) = ^(float w, int x, int y) { return(x); };

// Creating a block in CPP/ObjCPP with variable type inferred automatically -- NOT TOO BAD
auto someBlock = ^(float w, int x, int y) { return(x); };

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#import <Foundation/Foundation.h>
#import <CoreLocation/CoreLocation.h>

typedef void (^JWLocationManagerCallback)(CLLocation *location);
typedef void (^JWLocationManagerErrorCallback)(NSError *error);

@interface JWLocationManager : NSObject <CLLocationManagerDelegate>

@property (nonatomic, copy) NSString *purpose;
@property (nonatomic, copy) JWLocationManagerCallback locationUpdatedBlock;

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#
# Uncrustify Configuration File
# File Created With UncrustifyX 0.4.3 (252)
#

# Alignment
# ---------

## Alignment

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#
# Uncrustify Configuration File
# File Created With UncrustifyX 0.4.3 (252)
#

# Alignment
# ---------

## Alignment

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//  Created by Alex Gordon on 11/02/2013.

#import <Foundation/Foundation.h>

#pragma mark Objects

static BOOL respondsTo(id x, SEL s) {
    if (!x || !s)
        return NO;
    return [x respondsToSelector:s];

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List of Block Declaration Syntaxes

Throughout, let

• return_type be the type of object/primitive/etc. you'd like to return (commonly void)
• blockName be the variable name of the block you're creating
• var_type be the type object/primitive/etc. you'd like to pass as an argument (leave blank for no parameters)
• varName be the variable name of the given parameter And remember that you can create as many parameters as you'd like.

Blocks as Variables

Possibly the most common for of declaration.