This guide aims to quickly answer two questions you might get when you encounter unfamiliar syntax in Reason: What is this And where can I learn more? If it doesn't, please make an issue or a PR.
The guide is divided into these sections
| Keyword | Usage | What is this? | Where can I learn more? |
|---|---|---|---|
as |
{ foo, bar } as record |
Binds the item being destructured to a name | RWO - OCaml Manual |
as |
array 'a as 'this |
A type alias | OCaml Manual |
fun |
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let |
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mutable |
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type |
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switch |
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rec |
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in |
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to |
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downto |
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module |
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module type |
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ref |
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true |
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false |
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if |
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else |
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for |
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while |
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open |
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exception |
| Operator/Symbol | Usage | What is this? | Where can I learn more? |
|---|---|---|---|
+., *., etc. |
3.1 +. 2.3 |
Floating point operators | |
^ |
"Hello " ^ "world" |
String concatenation | |
## |
obj##property |
Object (not record) property access | |
| ` | >` | `"hello" | > print_string` |
@@ |
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=> |
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| ` | ` | ||
' |
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` |
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:: |
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{..} |
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... |
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; |
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== |
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=== |
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!= |
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!== |
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_ |
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land |
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lor |
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lxor |
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lnot |
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lsl |
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lsr |
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not |
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&& |
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| ` | ` | ||
:= |
>>=
!?
| Syntax | Usage | What is this? | Where can I learn more? |
|---|---|---|---|
[a, b, ...c] |
let a = [1, 2, ...nums] |
Immutable list append | |
[_, _, ..._] |
let [b, c, rest] = a |
List destructuring | |
| `type _ = | _ | _` | |
fun ⁔ => ... |
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| `switch { | => ...` | ||
{..} |
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{. ⁔ } |
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{ "<x>": <y> } |
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| `[ | , | ]` | |
[@@...] |
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[%...] |
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/* ...*/ |
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<x> ? <y> : <z> |
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(<x>, <y>) |
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module <X> (<Y>: <Z>) => ... |
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<..> |