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

Dollar is a Swift library that provides useful functional programming helper methods without extending any built in objects. It is similar to Lo-Dash or Underscore.js in Javascript.

• Setup
• API Documentation
• Usage
  • Array
  • Date
  • Dictionary
  • Int
  • String
  • Range
• Contributing

Add github "ankurp/Cent" ~> 5.1.0 to your Cartfile and run carthage update. If unfamiliar with Carthage then checkout their Getting Started section.

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.

Add the following dependency .Package(url: "https://github.com/ankurp/Dollar", majorVersion: 5, 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

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.

• 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

• If you need help, use gitter.im or post a question on Stack Overflow with tag dollar.swift.
• If you'd like to ask a general question, use Stack Overflow.
• 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.

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.

var array = [1, 2, 3]
array << 4
=> [1, 2, 3, 4]
array << [5, 6]
=> [1, 2, 3, 4, 5, 6]

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

let array = ["foo", "spam", "bar", "eggs"]
let some = array.at(1, 3)
=> ["spam", "eggs"]

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

let array = ["foo", "spam", "bar", "eggs"]
array.each {
  print($0)
}
=> ["foo", "spam", "bar", "eggs"]

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

let array = ["foo", "spam", "bar", "eggs"]
array.each { (index, elem)
  print("\(index) - \(elem)")
}
=> ["foo", "spam", "bar", "eggs"]

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.

[1, 2, 3].cycle(2) {
  print($0)
}
// Prints the following
123123

[1, 2, 3].cycle {
  print($0)
}
// Cycles in an infinite loop

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

["angry", "hungry"].every { (a: String) -> (Bool) in 
  a.hasSuffix("gry") 
}
=> true

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

let array = ["foo", "spam", "bar", "eggs"]
array.indexOf("spam")
=> 1
array.indexOf("None")
=> nil

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.

let arr = [1, 2, 3, 4, 5, 6, 7, 8]
arr.fetch(100)
=> nil

arr.fetch(100, orElse: 42)
=> 42

arr.fetch(-1)
=> 8

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

let ind: int? = ["foo", "bar", "spam", "eggs"].findIndex {
  $0.length == 4
}
ind! == 2 
=> true

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

let ind: int? = ["foo", "bar", "spam", "eggs"].findLastIndex {
  $0.length == 4 
}
ind! == 3 
=> true

Gets the first element in the array.

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

Flattens a nested array of any depth.

let unFlattened = ["foo", ["bar"], [["spam"]], [[["eggs"]]] ]
let flattened = unFlattened.flatten() 
=> ["foo", "bar", "spam", "eggs"]

Get element at index

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

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

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

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

Gets the last element from the array.

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

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

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

Retrieves the minimum value in an array.

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

Retrieves the maximum value in an array.

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

Remove element from array

var arr = ["A", "B", "C", "D", "E"]
arr.remove("B")
=> ["A", "C", "D", "E"]

Checks if a given value is present in the array.

var arr = ["A", "B", "C", "D", "E"]
arr.contains("C")
=> true
arr.contains("Z")
=> false

Creates an object composed from arrays of keys and values.

let keys = ["A", "B", "C"]
let vals = [1,2,3]
keys.zipObject(vals)
=> ["A":1,"B":2,"C":3]

Checks if the array has one or more elements.

let arr = [1,2,3]
arr.isNotEmpty
=> true

Get string description of Character

let ch: Character = "A"
let str = ch.description
=> "A"

Get int representation of character

Character("A").ord
=> 65

Returns a new Date given the year month and day

let date = Date.from(2014, 1, 1) 
=> "Jan 1, 2014, 12:00 AM"

Returns a new Date given the unix timestamp (timeIntervalSince1970)

let date = Date.from(unix: 1_388_552_400.0)
=> "Jan 1, 2014, 12:00 AM"

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

let parsedDate = Date.parse("2014-01-01", format: "yyyy-MM-dd")
=> "Jan 1, 2014, 12:00 AM"

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

let currentUnix = Date.unix()
=> 1,388,552,400.0

var otherNSDate = Date()
let otherUnix = Date.unix(otherDate)
=> 1,388,552,400.0

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

1.day.ago
=> "Apr 10, 2015, 11:51 AM"
4.hours.fromNow
=> "Apr 11, 2015, 3:51 PM"

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

var dic = ["foo": "bar"] 
let anotherDic = ["foo": "baz", "spam": "eggs"]
dic.merge(anotherDic)
=> ["foo": "baz", "spam": "eggs"]

Invoke a callback n times with callback that takes index

5.times { print("Na") } 
=> "NaNaNaNaNa"

Invoke a callback n times

5.times { (a: Int) -> () in print("\(a) ") } 
=> 0 1 2 3 4  

Get ASCII character from integer

65.char
=> "A"

Check if int is even

2.isEven
=> true

1.isEven
=> false

Check if int is odd

3.isOdd
=> true

2.isOdd
=> false

Splits the int into array of digits

4208.digits()
=> [4, 2, 0, 8]

LCM method return least common multiple with number passed

3.lcm(10)
=> 30

3.lcm(9)
=> 9

GCD method return greatest common denominator with number passed

3.gcd(10)
=> 1

3.gcd(9)
=> 3

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

3.random()
=> 2

3.random()
=> 1

Returns factorial of integer

3.factorial()
=> 6

0.factorial()
=> 1

Returns true if i is in interval or range

5.isIn(1...10)
=> true

10.isIn(1..<10)
=> false

Get the next int

10.next()
=> 11

Get the previous int

10.prev()
=> 9

Invoke the callback from int up to and including limit

3.upTo(5) {
  print("Hi")
}
Prints "HiHiHi"

Invoke the callback from int down to and including limit

3.upTo(0) {
  print("Hi")
}
Prints "HiHiHiHi"

Get the length of the string

"Hello".length
=> 5

Get the camel case representation of the string

"__Dollar and cent-- dollarANDCent".camelCase
=> "dollarAndCentDollarAndCent"

Get the kebab case representation of the string

"__Dollar and cent-- dollarANDCent".kebabCase
=> "dollar-and-cent-dollar-and-cent"

Get the snake case representation of the string

"__Dollar and cent-- dollarANDCent".snakeCase
=> "dollar_and_cent_dollar_and_cent"

Get the start case representation of the string

"__Dollar and cent-- dollarANDCent".startCase
=> "Dollar And Cent Dollar And Cent"

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

"Dollar" =~ "oll"
=> true

Get string concatenated n times

"Hi Swift! " * 3
=> "Hi Swift! Hi Swift! Hi Swift! "

Get character at a subscript

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

"Hi"[5]
=> nil

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

let proj = "Dollar and Cent"
proj["^.+[^and Cent]"]
=> {Some: "Dollar"}

Get substring using subscript notation and by passing a range

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

Get the start index of character

"hello world".indexOf(Character("o"))!
=> 4

Get the start index of string

"hello world".indexOf("llo")!
=> 2

"hello world".indexOf("illo")
=> nil

Get the start index of regex pattern inside the string

"hello world".indexOf(".llo")!
=> 1

Get an array from string split using the delimiter character

"Hello World".split(" ") 
=> ["Hello", "World"]

Get string without leading spaces

let leadingSpace = "  Hello"
leadingSpace.lstrip()
=> "Hello"

Get string without trailing spaces

let trailingSpace = "Hello   "
trailingSpace.rstrip()
=> "Hello"

Get string without leading or trailing spaces

let spaces = "   Hello   "
spaces.strip()
=> "Hello"

Init with regex pattern as string

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

Return matches based on String passed.

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

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

re.test("Str")
=> false

Escape string with regex characters

Regex.escape("Hello.World")
=> "Hello\.World"

Check the equality of two ranges

(1...5) == (1...5) 
=> true

(1..<5) == (1...5) 
=> false

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

(1...5).eachWithIndex { (a: Int) -> () in print("\(a)") } 
=> 12345

For each index in the range invoke the callback

(1...5).each { print("Na") } 
=> "NaNaNaNaNa"

If you are interested in contributing checkout CONTRIBUTING.md