ITEC 380 2022fall ibarland

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racket intro
types, function-application, syntax, function-composition, signatures

When watching the videos below, you should be typing similar expressions in DrRacket yourself (download), and pausing to think about & answer questions as indicated.

The "demo'd" code file: [code: before, after]. (Provided just for convenience.)

• Types video (9m22s)
  
  
• Calling a function video (6m59s)
  
  
• Syntax of function-call video (6m18s)
  
  
• Nested function calls ("composing functions") video (11m21s)
  
  
• signatures (to be covered in class).

  Updated syntax: Our [code: before, after] has our updated syntax, compared to the video; rather than int, string -> boolean we should write (-> integer? string? boolean?). This latter syntax is usable as actual (enforced-at-runtime) type-declarations using define/contract.

• defineing constants, and (next lecture) functions.

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