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You don't really need to pay for a book. If you're experienced with C# it'll be pretty easy to pick up. But, if you really want one, the definitive choice is "

• Someone 11y ago
  "If you're experienced with C# it'll be pretty easy to pick up. But, if you really want one..." I disagree with the implication that people who know C# can just jump in without reading anything. For starters, you have to learn the syntax somewhere. For example, I don't see how one could learn the way one writes try-catch in Swift without reading about it, or how one learns about 'let' and 'var'. Secondly, there are deeper differences one has to learn. Some clear examples I can think of are: - protocols - collections are value types - checked integer arithmetic is the default - the way strings are sequences of extended grapheme clusters, not of bytes or Unicode code points So, read the book. If you know C# (or any remotely Algol-, Pascal- or C-like language), lots will be familiar, but there will be bits to learn that would be huge stumbling blocks if you didn't know about them.