typescriptCheatSheet.md

Tings personal awesome typescript cheat sheet

• A class is a type that can be instantiated
• interfaces should be used to define a common pattern that many classes wants to implement
• 'any' is commonly used when integrating typescript with javascript libraries
• difference between type and interface: types can be inferred, interfaces cannot

Terminology:

• Fancy english words:

  • explicit: stated clearly and in detail, leaving no room for confusion or doubt.
  • implicit: suggested though not directly expressed

• Typescript concepts:

  • type definitions
    • classes, interfaces and types
  • variable type definitions
    • Example:

      let test: string = 'hello';
      

    • Can be explicit or implicit
      • implicit:

        const test = 'hello';
        

      • explicit:

        const test: string = 'hello';
        

    • Special case:

      const test = {foo: 'bar'}; // implicit type will be inferred by typescript