Introduction

_.m is a port of Underscore.js to Objective-C. It provides functional programming helpers without extending any built-in objects.

_.m uses SubjectiveScript.m to bring JavaScript-like syntax and features into Objective-C.

Features

• Collection Functions: each, map, reduce, filter, find, and more
• Array Functions: first, last, flatten, union, intersection, etc.
• Function Functions: memoize, delay, throttle, debounce, once
• Object Functions: keys, values, extend, clone, isEqual
• Utility Functions: identity, times, uniqueId
• Chaining: Fluent API with chain() and value()

Quick Example

#import "_.h"

// Each
_.each(AI(1, 2, 3), ^(N* num, ...) {
    NSLog(@"%@", num);
});

// Map
A* doubled = _.map(AI(1, 2, 3), ^id(N* num, ...) {
    return N.I(num.I * 2);
});
// => [2, 4, 6]

// Filter
A* evens = _.filter(AI(1, 2, 3, 4, 5, 6), ^B(N* num, ...) {
    return num.I % 2 == 0;
});
// => [2, 4, 6]

Type Shortcuts

_.m uses shorthand type definitions for cleaner code:

Shorthand	Full Type
A*	NSArray*
NSA*	NSMutableArray*
O*	NSDictionary*
NSD*	NSMutableDictionary*
S*	NSString*
NSS*	NSMutableString*
N*	NSNumber*
NSO*	NSObject*
B	BOOL
I	NSInteger
UI	NSUInteger
F	float
D	double