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typescript (lang (type (function, (p:T1) => T2 (this parameter…

- - - - [a, ...b, ...c, d]
    - - {a:1, ...b}
      - you lose methods when you spread instances of an object
      - {...a, b:1}
  - - - [a, b] / [a, ...b] / [,a,b]
    - - {a, b} / {a, ...b} / {a:x, b:y} / {a, b=1}
  - - - (varX as string).length
      - (<string>varX).length
    - - null / undefined
    - - subtype of every type
      - always throws an exception or one that never returns
    - - const enum
      - declare enum
    - - nullable, string | null
    - - optional, function(a?: string) {}
        
        default, function(a="s") {}
      - rest, function(...a:string[]) {}
      - this parameter
        
        function f(this: void) {}
        
        function f(this: T) {}
      - overload