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Swift 4 titleized String Extension

Swift 4.2

Rails provides the titleize inflector (capitalizes all the words in a string), and I needed one for Swift too. The code snippet below adds a computed property to the String class and follows these rules:

  • The first letter of the first word of the string is capitalized
  • The first letter of the remaining words in the string are capitalized, except those that are considered “small words”

Create a file in your Xcode project named String+Titleized.swift and paste in the following String extension:

Configure SMALL_WORDS to your liking. In this example I was titleizing Spanish phrases, so my SMALL_WORDS contains various definite articles and conjunctions. An example of the usage and output:

Note: This post is a Swift 4.2 version of this one written in Swift 2.

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