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Algorithm+Array.swift
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117 lines (106 loc) · 3.31 KB
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/*
* Copyright (C) 2015 - 2016, Daniel Dahan and CosmicMind, Inc. <http://cosmicmind.io>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of Algorithm nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
extension Array where Element: Equatable {
mutating func removeObject(object: Element) -> Element? {
if let v: Int = indexOf(object) {
return removeAtIndex(v)
}
return nil
}
mutating func removeObjects(objects: Element...) {
removeObjects(objects)
}
mutating func removeObjects(objects: Array<Element>) {
for x in objects {
removeObject(x)
}
}
}
extension Array : ProbableType {
/**
The instance count of elements.
*/
public func countOf<Element: Equatable>(elements: Element...) -> Int {
return countOf(elements)
}
/**
The instance count of elements.
*/
public func countOf<Element: Equatable>(elements: Array<Element>) -> Int {
var c: Int = 0
for v in elements {
for x in self {
if v == x as! Element {
++c
}
}
}
return c
}
/**
The probability of elements.
*/
public func probabilityOf<Element: Equatable>(elements: Element...) -> Double {
return probabilityOf(elements)
}
/**
The probability of elements.
*/
public func probabilityOf<Element: Equatable>(elements: Array<Element>) -> Double {
return 0 == count ? 0 : Double(countOf(elements)) / Double(count)
}
/**
The probability of elements.
*/
public func probabilityOf(block: (element: Element) -> Bool) -> Double {
if 0 == count {
return 0
}
var c: Int = 0
for x in self {
if block(element: x) {
++c
}
}
return Double(c) / Double(count)
}
/**
The expected value of elements.
*/
public func expectedValueOf<Element: Equatable>(trials: Int, elements: Element...) -> Double {
return expectedValueOf(trials, elements: elements)
}
/**
The expected value of elements.
*/
public func expectedValueOf<Element: Equatable>(trials: Int, elements: Array<Element>) -> Double {
return Double(trials) * probabilityOf(elements)
}
}