CODEWITHSUNDEEP
f#
barii
barii

Reputation: 345

Round brackets, curly braces

I am trying to understand this code: https://github.com/CameronAavik/AdventOfCode/blob/master/Challenges/2018/Day03.fs

But I couldn't find any info about this "let something (...) { ... } = ..."syntax, for example:

let processBoundary (prevY, claimSet, total) {cursor=cursor; isAdding=isAdding; data=(top, height)} = ...

what is this? reminds me to a tuple and destructuring, but maybe it is not that.

thanks

Upvotes: 4

Views: 298

Answers (1)

TeaDrivenDev
TeaDrivenDev

Reputation: 6629

It is actually destructuring as with a tuple, just that it's a record in this case.

A notable difference is that while with a tuple you have to match the exact number and position of the individual parts, when destructuring a record, you can leave out any of the fields you're not interested in at that point.

I wrote a (non-exhaustive) blog post on different ways of pattern matching/destructuring in F# once; maybe that's helpful in understanding here.

Upvotes: 5

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