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website/ref/language: add hints for list operations #1903

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18 changes: 18 additions & 0 deletions website/ref/language.md
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Expand Up @@ -383,6 +383,24 @@ Examples:
▶ [lorem ipsum]
```

Common operations with lists can be achieved using the patterns below:

```elvish-transcript
~> var li = [lorem ipsum]
~> var new-li = (conj $li foo bar) # This emulates concatenating or appending.
~> put $new-li
▶ [lorem ipsum foo bar]
~> var newer-li = [foo bar $@li] # This emulates prepending.
~> put $newer-li
▶ [foo bar lorem ipsum]
```

See also:

- [`conj`](builtin.html#conj) builtin

- [`$@`](#variable-use) for variable exploding

## Map

A map is a value containing unordered key-value pairs.
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