Swift in 100 Seconds

Key Takeaways

swift a multi-paradigm compiled language created by apple famous for building apps that grow inside of apple's walled garden it was first introduced in 2014 at the worldwide developers conference and was designed as a modern successor to objective-c the original apple platform language that had been in use since the 1980s swift interops with objective-c but provides a shorter more readable syntax and features like memory safety and type inference to improve developer productivity today it's used to build mobile apps on ios desktop apps on mac os wearable apps for watch os but is also open source which means it can be used to build software outside of apple platforms it compiles to native machine code and is built on top of the llvm tool chain like many other modern languages however it also supports a readable print loop allowing you to experiment with code in a playground without needing to recompile making it a great language for beginners in addition it provides memory safety by preventing you from writing unsafe code by default and uses automatic reference counting to manage memory automatically to get started install it then create a file ending in.swift your code will start executing in the global scope there's no need for a main function create a variable with the var keyword followed by its name and value var creates a mutable variable which means its value can change in the future let on the other hand creates an immutable variable or constant it uses type inference to strongly type the value as a string but we can explicitly type it by adding a semicolon after the variable name every variable must be initialized with a value unless the type has a question mark which makes it an optional type allowing it to also contain a nil value it also supports optional chaining making it really easy to work with nil values functions are declared with the fun keyword and will use named parameters by default place an underscore before the name to use positional arguments instead now use a backslash with parentheses to interpolate these values into a string functions in swift are first class objects they can be passed as arguments used as return values and nested to create closures it also supports object-oriented patterns like classes and inheritance to encapsulate the var and fung keywords that you just learned now pull up the terminal and run the swift compiler to convert your code into a high performance executable congratulations your code is now ready to seek approval on the apple app store this has been the swift programming language in 100 seconds if you want to see more short videos like this make sure to hit the like button and subscribe thanks for watching and i will see you in the next one