Why discord.js using collections | discord.js - imagine an app | Page 1

silent belfry Sep 9, 2022, 6:14 PM

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I really don't understand why discord.js using collections for everything instead of arrays

Is it better for performance? or it's just a convenient way for new developers?

latent stormBOT Sep 9, 2022, 6:14 PM

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• What's your exact discord.js npm list discord.js and node node -v version?
• Post the full error stack trace, not just the top part!
• Show your code!
• Explain what exactly your issue is.
• Not a discord.js issue? Check out #useful-servers.

dreamy fossil Sep 9, 2022, 6:19 PM

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It provides a mapping of ids to instances. Instead of an array where you need to search for the right element sequentially. So yes, Performance when looking up a specific element is better

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Also collections provide additional methods you don’t have on arrays

silent belfry Sep 9, 2022, 6:20 PM

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is forEach function faster than changing collection to json and then loop on them?

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or the same speed

dreamy fossil Sep 9, 2022, 6:20 PM

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Yes, faster. Because you skip the conversion step

latent stormBOT Sep 9, 2022, 6:21 PM

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Converting a Collection to an array
You only need to convert it to an array if you need the index of an entry:
• Iteration (looping) is possible with for...of over Collection#values or forEach
• You can transform a Collection to an array with Collection#map
• If you need indices, you can get the array using [...collection.values()]

silent belfry Sep 9, 2022, 6:21 PM

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ok ty

red trellis Sep 10, 2022, 12:06 AM

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it's worth actually mentioning what Collections are

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Collection extends native Map by adding Array methods

#Why discord.js using collections