Adrián Ferreyra AdrianFerreyra
AdrianFerreyra
/ linkedListSwapElements.swift
Last active
October 31, 2017 18:54
Return the head node of the singly linked list with each pair of nodes swapped. If there is a last odd node leave it in place. Example: Input: 1 -> 2 -> 3 -> 4 -> 5 Output: 2 -> 1 -> 4 -> 3 -> 5
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| enum LinkedList { | |
| case empty | |
| indirect case node(T, LinkedList) | |
| func swapTwoFirst() -> LinkedList { | |
| switch self { | |
| case .node(let value, .node(let nextValue, let next)): | |
| return .node(nextValue, .node(value, next.swapTwoFirst())) |
sketchytech
/ Calculating a count for UTF16 string with unicode scalar characters - use utf16Count
Last active
September 17, 2015 20:58
Working with bytes and strings in Swift (Unicode Scalar, UTF8 and UTF16)
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| newStr = "hello 😂😒😡" | |
| // the number of elements: | |
| let count = newStr.utf16Count | |
| // create array of appropriate length: | |
| var array = [UInt16](count: count, repeatedValue: 0) | |
| for a in enumerate(newStr.utf16) { |