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https://github.com/ankurp/cent

Extensions for Swift Standard Types and Classes
https://github.com/ankurp/cent

dictionary-extensions range-extensions swift xcode

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Extensions for Swift Standard Types and Classes

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Cent [![Build Status](https://travis-ci.org/ankurp/Cent.svg?branch=master)](https://travis-ci.org/ankurp/Cent) ![CocoaPods](https://img.shields.io/cocoapods/v/Cent.svg)

===========

[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/ankurp/Dollar?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)



Cent is a library that extends certain Swift object types using the extension feature and gives its two cents to Swift language.



[Dollar](https://github.com/ankurp/Dollar) is a Swift library that provides useful functional programming helper methods without extending any built in objects. It is similar to [Lo-Dash](https://lodash.com) or [Underscore.js](http://underscorejs.org) in Javascript.



## Contents ##



- [Setup](#setup)

- [API Documentation](http://www.dollarswift.org)

- [Usage](#cent-usage)

  - [Array](#array-extensions)

  - [Date](#date-extensions)  

  - [Dictionary](#dictionary-extensions)

  - [Int](#int-extensions)

  - [String](#string-extensions)

  - [Range](#range-extensions)

- [Contributing](#contributing)



# Setup #



## Using [cocoapods](http://cocoapods.org/) version 0.36.x or greater



Add `pod 'Cent'` to your `Podfile` and run `pod install`. Add `use_frameworks!` to the end of the `Podfile`. Requires cocoapod version 0.36.x or greater.



## Using [Swift Package Manager](https://github.com/apple/swift-package-manager)



Add the following dependency `.Package(url: "https://github.com/ankurp/Cent", majorVersion: 6, minor: 0)` to your `Package.swift` file and then run `swift build`. Requires swift version 2.2 or greater that you can install from https://swift.org



## Using `git submodule`



1. If you are using git then add Cent as a submodule using `git submodule add https://github.com/ankurp/Cent.git`. If not using git download the project using `git clone https://github.com/ankurp/Cent.git` in your project folder.

2. Open the `Cent` folder. Drag Cent.xcodeproj, inside the Cent folder, into the file navigator of your Xcode project.

3. In Xcode, navigate to the target configuration window by clicking on the blue project icon, and selecting the application target under the "Targets" heading in the sidebar.

4. In the tab bar at the top of that window, open the "Build Phases" panel.

5. Expand the "Link Binary with Libraries" group, and add Cent.framework.

6. In your project file `import Cent` and you can call all of the helper functions.



## Support for Xcode and Swift



* For Xcode 9 (Swift 4) user version `7.0.0`

* For Xcode 8 (Swift 3) user version `6.0.4`

* For Xcode 7 (Swift 2) use version `4.1.0` or `5.2.0`

* For Xcode 6.3 (Swift 1.2) use version `3.0.3`

* For Xcode 6.1 and 6.2 (Swift 1.1) use version `2.2.0`



## Communication ##



- If you **need help**, use [gitter.im](https://gitter.im/ankurp/Dollar) or post a question on [Stack Overflow](http://stackoverflow.com/questions/tagged/dollar.swift) with tag `dollar.swift`.

- If you'd like to **ask a general question**, use [Stack Overflow](http://stackoverflow.com/questions/tagged/dollar.swift).

- If you **found a bug**, open an issue.

- If you **have a feature request**, open an issue.

- If you **want to contribute**, submit a pull request.



# Cent Usage #



## Array Extensions ##



### `<< elem: Element -> [Element]`



Overloaded operator to append element to an array or append elements from another array into the first array. Return array with the element appended in the end.



```swift

var array = [1, 2, 3]

array << 4

=> [1, 2, 3, 4]

array << [5, 6]

=> [1, 2, 3, 4, 5, 6]

```



### `at(indexes: Int...) -> [Element]`



Creates an array of elements from the specified indexes, or keys, of the collection.



```swift

let array = ["foo", "spam", "bar", "eggs"]

let some = array.at(1, 3)

=> ["spam", "eggs"]

```



### `each(callback: (Element) -> ()) -> [Element]`



For each item in the array invoke the callback by passing the elem



```swift

let array = ["foo", "spam", "bar", "eggs"]

array.each {

  print($0)

}

=> ["foo", "spam", "bar", "eggs"]

```



### `eachWithIndex(callback: (Int, Element) -> ()) -> [Element]`



For each item in the array invoke the callback by passing the elem along with the index



```swift

let array = ["foo", "spam", "bar", "eggs"]

array.each { (index, elem)

  print("\(index) - \(elem)")

}

=> ["foo", "spam", "bar", "eggs"]

```



### `cycle(times: Int, callback: (Element) -> U)`



Cycles through the array definetly or indefinetly passing each element into the callback function. The second parameter is to specify how many times to cycle through the array. If left out it will cycle indefinetly.



```swift

[1, 2, 3].cycle(2) {

  print($0)

}

// Prints the following

123123



[1, 2, 3].cycle {

  print($0)

}

// Cycles in an infinite loop

```



### `every(callback: (Element) -> Bool) -> Bool`



Checks if the given callback returns true value for all items in the array.



```swift

["angry", "hungry"].every { (a: String) -> (Bool) in 

  a.hasSuffix("gry") 

}

=> true

```



### `indexOf(value: T) -> Int`



Gets the index at which the first occurrence of value is found.



```swift

let array = ["foo", "spam", "bar", "eggs"]

array.indexOf("spam")

=> 1

array.indexOf("None")

=> nil

```



### `fetch(index: Int, orElse: T? = .None) -> T!`



Get element from an array at the given index which can be negative to find elements from the end of the array. A default value can be returned if indexing out of bounds.



```swift

let arr = [1, 2, 3, 4, 5, 6, 7, 8]

arr.fetch(100)

=> nil



arr.fetch(100, orElse: 42)

=> 42



arr.fetch(-1)

=> 8

```



### `findIndex(callback: (Element) -> Bool) -> Int?`



This method is like find except that it returns the index of the first element that passes the callback check.



```swift

let ind: int? = ["foo", "bar", "spam", "eggs"].findIndex {

  $0.length == 4

}

ind! == 2 

=> true

```



### `findLastIndex(callback: (Element) -> Bool) -> Int?`



This method is like findIndex except that it iterates over elements of the array from right to left.



```swift

let ind: int? = ["foo", "bar", "spam", "eggs"].findLastIndex {

  $0.length == 4 

}

ind! == 3 

=> true

```



### `first() -> Element?`



Gets the first element in the array.



```swift

let first = ["foo", "bar"].first()

=> "foo"

```



### `flatten() -> [Element]`



Flattens a nested array of any depth.



```swift

let unFlattened = ["foo", ["bar"], [["spam"]], [[["eggs"]]] ]

let flattened = unFlattened.flatten() 

=> ["foo", "bar", "spam", "eggs"]

```



### `get(index: Int) -> Element?`



Get element at index



```swift

let element = ["foo", "bar"].get(0)

element!

=> "foo"



let nothing = ["foo", "bar"].get(1000)

=> nil

```



### `initial(numElements: Int? = 1) -> [Element]`



Gets all but the last element or last n elements of an array.



```swift

let initial = ["foo", "bar", "spam"].initial(2) 

=> ["foo"]

```



### `last() -> Element?`



Gets the last element from the array.



```swift

let last = ["foo", "bar"].last() 

=> "bar"

```



### `rest(numElements: Int? = 1) -> [Element]`



The opposite of initial this method gets all but the first element or first n elements of an array.



```swift

let rest = ["foo", "bar", "spam"].rest(2)

=> ["spam"]

```



### `min() -> T?`



Retrieves the minimum value in an array.



```swift

let min = [ 0, 1, 2 ].min()

=> 0

```



### `max() -> T?`



Retrieves the maximum value in an array.



```swift

let max = [ 0, 1, 2].max()

=> 2

```



### `remove(value: T) -> T?`



Remove element from array



```swift

var arr = ["A", "B", "C", "D", "E"]

arr.remove("B")

=> ["A", "C", "D", "E"]

```



### `contains(value: T) -> Bool`



Checks if a given value is present in the array.



```swift

var arr = ["A", "B", "C", "D", "E"]

arr.contains("C")

=> true

arr.contains("Z")

=> false

```



### `zipObject(values: [T]) -> [Element:T]`



Creates an object composed from arrays of keys and values.



```swift

let keys = ["A", "B", "C"]

let vals = [1,2,3]

keys.zipObject(vals)

=> ["A":1,"B":2,"C":3]

```



### `isNotEmpty`



Checks if the array has one or more elements.



```swift

let arr = [1,2,3]

arr.isNotEmpty

=> true

```



## Character Extensions ##



### `"A".description -> String`



Get string description of Character



```swift

let ch: Character = "A"

let str = ch.description

=> "A"

```



### `"A".ord -> Int`



Get int representation of character



```swift

Character("A").ord

=> 65

```



## Date Extensions ##



### `Date.from(#year: Int, month: Int, day: Int) -> NSDate`



Returns a new Date given the year month and day



```swift

let date = Date.from(2014, 1, 1) 

=> "Jan 1, 2014, 12:00 AM"

```



### `Date.from(#unix: Double) -> NSDate`



Returns a new Date given the unix timestamp (timeIntervalSince1970)



```swift

let date = Date.from(unix: 1_388_552_400.0)

=> "Jan 1, 2014, 12:00 AM"

```



### `Date.parse(dateStr: String, format: String = "yyyy-MM-dd") -> NSDate`



Parses the date based on the format and return a new Date



```swift

let parsedDate = Date.parse("2014-01-01", format: "yyyy-MM-dd")

=> "Jan 1, 2014, 12:00 AM"

```



### `Date.unix(date: NSDate = NSDate()) -> Double`



Returns the unix timestamp of the date passed in or the current unix timestamp



```swift

let currentUnix = Date.unix()

=> 1,388,552,400.0



var otherNSDate = Date()

let otherUnix = Date.unix(otherDate)

=> 1,388,552,400.0

```



### `Int.hour.fromNow` et al.



Use the following syntax to calculate dates and times based on the user's current calendar. 



```swift

1.day.ago

=> "Apr 10, 2015, 11:51 AM"

4.hours.fromNow

=> "Apr 11, 2015, 3:51 PM"

```



## Dictionary Extensions ##



### `merge(dictionaries: Dictionary...)`



Merges the dictionary with dictionaries passed. The latter dictionaries will override values of the keys that are already set



```swift

var dic = ["foo": "bar"] 

let anotherDic = ["foo": "baz", "spam": "eggs"]

dic.merge(anotherDic)

=> ["foo": "baz", "spam": "eggs"]

```



## Int Extensions ##



### `times(callback: (Int) -> ())`



Invoke a callback n times with callback that takes index



```swift

5.times { (a: Int) -> () in print("\(a) ") } 

=> 0 1 2 3 4  

```



### `times (function: () -> ())`



Invoke a callback n times



```swift

5.times { print("Na") } 

=> "NaNaNaNaNa"

```



### `char -> Character`



Get ASCII character from integer



```swift

65.char

=> "A"

```



### `isEven`



Check if int is even



```swift

2.isEven

=> true



1.isEven

=> false

```



### `isOdd`



Check if int is odd



```swift

3.isOdd

=> true



2.isOdd

=> false

```



### `digits() -> [Int]`



Splits the int into array of digits



```swift

4208.digits()

=> [4, 2, 0, 8]

```



### `lcm() -> Int`



LCM method return least common multiple with number passed



```swift

3.lcm(10)

=> 30



3.lcm(9)

=> 9

```



### `gcd() -> Int`



GCD method return greatest common denominator with number passed



```swift

3.gcd(10)

=> 1



3.gcd(9)

=> 3

```



### `random() -> Int`



Returns random number from 0 upto but not including value of integer



```swift

3.random()

=> 2



3.random()

=> 1

```



### `factorial() -> Int`



Returns factorial of integer



```swift

3.factorial()

=> 6



0.factorial()

=> 1

```



### `isIn(interval) -> Bool`



Returns true if i is in interval or range



```swift

5.isIn(1...10)

=> true



10.isIn(1..<10)

=> false

```



### `next() -> Int`



Get the next int



```swift

10.next()

=> 11

```



### `prev() -> Int`



Get the previous int



```swift

10.prev()

=> 9

```



### `upTo(limit: Int, callback: () -> ())`



Invoke the callback from int up to and including limit



```swift

3.upTo(5) {

  print("Hi")

}

Prints "HiHiHi"

```



### `downTo(limit: Int, callback: () -> ())`



Invoke the callback from int down to and including limit



```swift

3.downTo(0) {

  print("Hi")

}

Prints "HiHiHiHi"

```



## String Extensions ##



### `.length`



Get the length of the string



```swift

"Hello".length

=> 5

```



### `.camelCase`



Get the camel case representation of the string



```swift

"__Dollar and cent-- dollarANDCent".camelCase

=> "dollarAndCentDollarAndCent"

```



### `.kebabCase`



Get the kebab case representation of the string



```swift

"__Dollar and cent-- dollarANDCent".kebabCase

=> "dollar-and-cent-dollar-and-cent"

```



### `.snakeCase`



Get the snake case representation of the string



```swift

"__Dollar and cent-- dollarANDCent".snakeCase

=> "dollar_and_cent_dollar_and_cent"

```



### `.startCase`



Get the start case representation of the string



```swift

"__Dollar and cent-- dollarANDCent".startCase

=> "Dollar And Cent Dollar And Cent"

```



### `=~ str: String -> Bool`



Does a regex match of whether regex string on the right is matches the string on the left



```swift

"Dollar" =~ "oll"

=> true

```



### `* n: Int -> String`



Get string concatenated `n` times



```swift

"Hi Swift! " * 3

=> "Hi Swift! Hi Swift! Hi Swift! "

```



### `[i: Int] -> Character?`



Get character at a subscript



```swift

"Hello World"[6] == "W"

=> true



"Hi"[5]

=> nil

```



### `[str: String] -> String?`



Returns the substring based on the first regex match passed in the subscript



```swift

let proj = "Dollar and Cent"

proj["^.+[^and Cent]"]

=> {Some: "Dollar"}

```



### `[r: Range] -> String`



Get substring using subscript notation and by passing a range



```swift

"Hello World"[0..<5] == "Hello" 

=> true

```



### `indexOf(char: Character) -> Int?`



Get the start index of character



```swift

"hello world".indexOf(Character("o"))!

=> 4

```



### `indexOf(str: String) -> Int?`



Get the start index of string



```swift

"hello world".indexOf("llo")!

=> 2



"hello world".indexOf("illo")

=> nil

```



### `indexOf(pattern: String) -> Int?`



Get the start index of regex pattern inside the string



```swift

"hello world".indexOf(".llo")!

=> 1

```



### `split(delimiter: Character) -> [String]`



Get an array from string split using the delimiter character



```swift

"Hello World".split(" ") 

=> ["Hello", "World"]

```



### `lstring() -> String`



Get string without leading spaces



```swift

let leadingSpace = "  Hello"

leadingSpace.lstrip()

=> "Hello"

```



### `rstring() -> String`



Get string without trailing spaces



```swift

let trailingSpace = "Hello   "

trailingSpace.rstrip()

=> "Hello"

```



### `strip() -> String`



Get string without leading or trailing spaces



```swift

let spaces = "   Hello   "

spaces.strip()

=> "Hello"

```



## Regex ##



### `init`



Init with regex pattern as string



```swift

Regex.init("^Hello.World$") // Regex that matches "Hello World"

```



### `matches(testStr: String) -> [AnyObject]`



Return matches based on String passed.



```swift

let re = Regex.init("^Hello.World$")

re.matches("Hello World")

```



### `test(testStr: String) -> Bool`



```swift

let re = Regex.init("^Hello.World$")

re.test("Hello World")

=> true



re.test("Str")

=> false

```



### `escapeStr(str: String) -> String`



Escape string with regex characters



```swift

Regex.escape("Hello.World")

=> "Hello\.World"

```



## Range Extensions ##



### equals - `==`



Check the equality of two ranges



```swift

(1...5) == (1...5) 

=> true



(1..<5) == (1...5) 

=> false

```



### `eachWithIndex(callback: (T) -> ())`



For each index in the range invoke the callback by passing the item in range



```swift

(1...5).eachWithIndex { (a: Int) -> () in print("\(a)") } 

=> 12345

```



### `each(callback: () -> ())`



For each index in the range invoke the callback



```swift

(1...5).each { print("Na") } 

=> "NaNaNaNaNa"

```



# Contributing #

If you are interested in contributing checkout [CONTRIBUTING.md](https://github.com/ankurp/Cent/blob/master/CONTRIBUTING.md)