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swift2 - Swift: guard let vs if let - Stack Overflow The Swift Docs on Control Flow explain the idea behind that: Using a guard statement for requirements improves the readability of your code, compared to doing the same check with an if statement
What is the difference between `let` and `var` in Swift? 374 What is the difference between let and var in Apple's Swift language? In my understanding, it is a compiled language but it does not check the type at compile time It makes me confused How does the compiler know about the type error? If the compiler doesn't check the type, isn't it a problem with production environment?
ios - Swift: Testing optionals for nil - Stack Overflow Swift 3 0, 4 0 There are mainly two ways of checking optional for nil Here are examples with comparison between them 1 if let if let is the most basic way to check optional for nil Other conditions can be appended to this nil check, separated by comma The variable must not be nil to move for the next condition If only nil check is required, remove extra conditions in the following code