Andrey (azangru) wrote,
Andrey
azangru

Typescript surprises me.

Say we have a function:



What will the type of the return value be? What if there is no colon in the provided string — then bar will be undefined. But typescript has the utmost confidence in the programmer, and is happy to infer that both foo and bar are strings:



This is dangerous! Here, we shall get an undefined is not a function:



Flow behaves the same, by the way.
Subscribe

  • (no subject)

    Someone who self-identifies as a technical writer, among other things, begins her article How To Build An E-Commerce Site With Angular 11, Commerce…

  • (no subject)

    Today I learned that "open-source" does not mean just having the source code in the open. I thought the legalities were only around the term "free…

  • (no subject)

    Cute; but as far as I understand, it is React that innovates on the apis and Preact (and others) that follows to maintain compatibility or…

  • Post a new comment

    Error

    default userpic
    When you submit the form an invisible reCAPTCHA check will be performed.
    You must follow the Privacy Policy and Google Terms of use.
  • 3 comments