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add usage fst and snd for tuple #663

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add usage fst and snd for tuple #663

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18 changes: 18 additions & 0 deletions pages/docs/manual/latest/tuple.mdx
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Expand Up @@ -59,6 +59,24 @@ var y = 30.5;

</CodeTab>

To get first or second member of a tuple, use `fst` or `snd` function:

<CodeTab labels={["ReScript", "JS Output"]}
```res example
let tup = (1, "ReScript")
let f = tup->fst
let s = tup->snd
```
```js
var tup = [
1,
"ReScript"
];
var f = 1;
var s = "ReScript";
```
</CodeTab>

The `_` means you're ignoring the indicated members of the tuple.

Tuples aren't meant to be updated mutatively. You'd create new ones by destructuring the old ones:
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