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JavaScript Maps are super underrated. Keys of a map can be anything - including an object! Here I'm using the new groupBy proposed API to group array items into a Map or an Object →

Wes Bos

437,608 subscribers

240,399 次观看 • 3 年前 •via X (Twitter)

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11 条评论

Nick Taylor 的头像

Nick Taylor3 年前

WeakMaps ftw as well!

Wes Bos 的头像

Wes Bos3 年前

Nothing better than something that cleans up

Paulo Reis 的头像

Paulo Reis3 年前

I've been using the JavaScript Maps a lot, thanks for the teachings 💯

Wes Bos 的头像

Wes Bos3 年前

big fan!

zayenz 🐀 的头像

zayenz 🐀3 年前

Maps are great, but I really miss structural equality for the keys when they are objects, as that is so much more useful. Especially if the key is computed at lookup.

Wes Bos 的头像

Wes Bos3 年前

I agree, I wonder if we will ever get that in JS

Web-Dev-Codi 的头像

Web-Dev-Codi3 年前

YT comment: You should use a for loop for performance. Wes: I'm iterating over 3 things brotha. 🤣 This was hilarious

vovô ermitão 的头像

vovô ermitão3 年前

except that it lacks a hashing function hook

Wes Bos 的头像

Wes Bos3 年前

@crudspecialist What would we use that for? Not snark, curious!

Rocky 的头像

Rocky3 年前

@wesbos where can we find this video or podcasts ? Really interested in it

Wes Bos 的头像

Wes Bos3 年前

This is it - I made it for twitter

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