roc-lang/roc
1
1
Fork 0
mirror of https://github.com/roc-lang/roc.git synced 2024-11-13 09:49:11 +03:00
Code Issues Packages Projects Releases Wiki Activity

Corrections for List docs

Browse Source
This commit is contained in:
Brian Carroll 2022-10-08 08:40:29 +01:00
parent fd42879dc4
commit 4bebe7e236
No known key found for this signature in database
GPG Key ID: 9CF4E3BF9C4722C7
1 changed files with 6 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
crates/compiler/builtins/roc/List.roc
View File

@ -88,9 +88,8 @@ interface List
##
## ## Performance Details
##
## Under the hood, a list is a record containing a `len : Nat` field as well
## as a pointer to a reference count and a flat array of bytes. Unique lists
## store a capacity #Nat instead of a reference count.
## Under the hood, a list is a record containing a `len : Nat` field, a `capacity : Nat`
## field, and a pointer to a reference count and a flat array of bytes.
##
## ## Shared Lists
##
@ -112,9 +111,8 @@ interface List
## begins with a refcount of 1, because so far only `ratings` is referencing it.
##
## The second line alters this refcount. `{ foo: ratings` references
## the `ratings` list, which will result in its refcount getting incremented
## from 0 to 1. Similarly, `bar: ratings }` also references the `ratings` list,
## which will result in its refcount getting incremented from 1 to 2.
## the `ratings` list, and so does `bar: ratings }`. This will result in its
## refcount getting incremented from 1 to 3.
##
## Let's turn this example into a function.
##
@ -132,11 +130,11 @@ interface List
##
## Since `ratings` represented a way to reference the list, and that way is no
## longer accessible, the list's refcount gets decremented when `ratings` goes
## out of scope. It will decrease from 2 back down to 1.
## out of scope. It will decrease from 3 back down to 2.
##
## Putting these together, when we call `getRatings 5`, what we get back is
## a record with two fields, `foo`, and `bar`, each of which refers to the same
## list, and that list has a refcount of 1.
## list, and that list has a refcount of 2.
##
## Let's change the last line to be `(getRatings 5).bar` instead of `getRatings 5`:
##