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Aral Balkan (aral@mastodon.ar.al)'s status on Thursday, 31-Aug-2023 18:26:18 JST Aral Balkan

Ran into this basic JavaScript scope gotcha today.
Just goes to show, you could be programming in a language for years and still get tripped up by some of the simplest issues.
https://codeberg.org/aral/gists/src/branch/main/javascriptScope.md
#JavaScript #scope #web #dev

In conversation about a year ago from mastodon.ar.al permalink
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  Aral Balkan (aral@mastodon.ar.al)'s status on Thursday, 31-Aug-2023 18:33:51 JST Aral Balkan
  in reply to
  - Ekaitz Zárraga 👹
  @ekaitz_zarraga Yeah ;)
  “It looks like it’s going to work because we’re used to things being hoisted in JavaScript but that only goes for functions.”
  
  In conversation about a year ago permalink
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  Ekaitz Zárraga 👹 (ekaitz_zarraga@mastodon.social)'s status on Thursday, 31-Aug-2023 18:33:52 JST Ekaitz Zárraga 👹
  in reply to
  
  @aral If you want to learn more about it, it happens because `const` doesn't apply hoisting in the way you are expecting it to:
  https://developer.mozilla.org/en-US/docs/Glossary/Hoisting
  In conversation about a year ago permalink
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    Hoisting - MDN Web Docs Glossary: Definitions of Web-related terms | MDN
    
    from MozDevNet
    
    JavaScript Hoisting refers to the process whereby the interpreter appears to move the declaration of functions, variables, classes, or imports to the top of their scope, prior to execution of the code.
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  Aral Balkan (aral@mastodon.ar.al)'s status on Thursday, 31-Aug-2023 18:34:54 JST Aral Balkan
  in reply to
  - Ekaitz Zárraga 👹
  @ekaitz_zarraga Although, thanks for the link, I’ll add it to the gist :)
  
  In conversation about a year ago permalink
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  Aral Balkan (aral@mastodon.ar.al)'s status on Thursday, 31-Aug-2023 18:37:02 JST Aral Balkan
  in reply to
  - Ekaitz Zárraga 👹
  - Piggo :verified_horse:
  @ekaitz_zarraga @piggo Thanks, folks, updated the gist with your contributions:
  https://codeberg.org/aral/gists/src/branch/main/javascriptScope.md
  
  In conversation about a year ago permalink
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  Ekaitz Zárraga 👹 (ekaitz_zarraga@mastodon.social)'s status on Thursday, 31-Aug-2023 18:38:51 JST Ekaitz Zárraga 👹
  in reply to
  
  @aral it's not only for functions. It's way more complex than that.
  It's a lot of fun.
  
  In conversation about a year ago permalink
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  Aral Balkan (aral@mastodon.ar.al)'s status on Thursday, 31-Aug-2023 18:38:51 JST Aral Balkan
  in reply to
  - Ekaitz Zárraga 👹
  @ekaitz_zarraga Yay! :)
  
  In conversation about a year ago permalink
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  Aral Balkan (aral@mastodon.ar.al)'s status on Thursday, 31-Aug-2023 19:18:22 JST Aral Balkan
  in reply to
  - Jeroen Baert
  @jbaert Yeah, hoisting is fun (when it works) :)
  
  In conversation about a year ago permalink
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  Jeroen Baert (jbaert@mastodon.social)'s status on Thursday, 31-Aug-2023 19:18:23 JST Jeroen Baert
  in reply to
  
  @aral Shouldn't even be able to call greet() in the first place! Undeclared!
  *strokes long beard*
  
  In conversation about a year ago permalink
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  Jeroen Baert (jbaert@mastodon.social)'s status on Thursday, 31-Aug-2023 19:18:24 JST Jeroen Baert
  in reply to
  
  @aral Me, as a C developer, not blinking: "Well of course!"
  
  In conversation about a year ago permalink
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  Ekaitz Zárraga 👹 (ekaitz_zarraga@mastodon.social)'s status on Thursday, 31-Aug-2023 19:19:20 JST Ekaitz Zárraga 👹
  in reply to
  
  @aral btw I know this because I've been teaching JS... if I didn't I wouldn't know about this.
  These concepts are hard to find or learn about if you are just coding on JS.
  
  In conversation about a year ago permalink
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  Aral Balkan (aral@mastodon.ar.al)'s status on Thursday, 31-Aug-2023 19:19:20 JST Aral Balkan
  in reply to
  - Ekaitz Zárraga 👹
  @ekaitz_zarraga Yeah, teaching is the best way to learn ;)
  
  In conversation about a year ago permalink
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  Aral Balkan (aral@mastodon.ar.al)'s status on Thursday, 31-Aug-2023 22:33:01 JST Aral Balkan
  in reply to
  - David Hayes :prami:
  @drhayes Ooh, I like that :)
  
  In conversation about a year ago permalink
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  David Hayes :prami: (drhayes@social.lol)'s status on Thursday, 31-Aug-2023 22:33:03 JST David Hayes :prami:
  in reply to
  
  @aral I'm sure you're sick of people popping in to explain this at you, so I won't do that.
  But I *will* say this has the coolest name of anything I know of in programming: it's the TEMPORAL DEAD ZONE!
  A touch of Star Trek in our JavaScript!
  
  In conversation about a year ago permalink
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  Aral Balkan (aral@mastodon.ar.al)'s status on Thursday, 31-Aug-2023 22:38:47 JST Aral Balkan
  in reply to
  - David Hayes :prami:
  @drhayes Just updated the gist with a reference to your toot and the MDN explanation of Temporal Dead Zone :) Thanks again :)
  https://codeberg.org/aral/gists/src/branch/main/javascriptScope.md
  In conversation about a year ago permalink
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    gists
    
    from aral
    
    A place for me to post and share small, self-contained code snippets.

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