Hello everyone,
I created a simple note app for learning purposes.
I use stable var array to save the data, now I’m stuck on how to remove the specific data from the array.
Please see the screenshot below.
It’s me again, I able to make it work now (see screenshot below).
Please let me know if you know any better solutions (I’m not 100% with my code), I really appreciate it.
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There are ways to improve this code, but the real reply should be: if you need to add or remove elements regularly, then do not use arrays! That always requires a full copy of the array (your code even performs 3 copies), which is very expensive and leads to quadratic cost.
What you want here is a map data structure, e.g., an RBMap with note ids as keys. Then you can just call the delete function on it.
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You can also use var Array with null defaults. Instead of deleting elements, you will just set them to null.
let items : [var ?Text] = Array.init<?Text>(1000, null);
You can go up to ~5mil elements if you need.
2 Likes
@rossberg I didn’t know that, I learned something new from your comment, thank you for that, I really appreciate it.
@infu wow, this is a clean code compared to what I did, thank you so much for this.
1 Like