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Query: Enrich the introduction #101

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Nov 19, 2021
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Query: Enrich the introduction #101

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7 changes: 7 additions & 0 deletions doc/query.md
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Expand Up @@ -26,6 +26,13 @@ These Clojure-like functions are supported in jet-lang:
- copy the entire input value: `identity` (for short `id`, thanks Haskell).
- print the result of an intermediate query: `jet/debug`.
- arithmetic: `+`, `-`, `*`, `/`, `inc`, `dec`.
- integers, keywords, and strings lookup up a value in the input (that's whe we need `#jet/lit`)

All these functions have an implicit _input_ argument.

To pass the input through a sequence of queries, just put them inside a vector.
Thus `[:user :name]` will get the name of the user inside the input. (You can omit
the vector for the top-level query.)

To learn more about how to use them, read the [tutorial](#tutorial) or go
straight to the [gallery](#gallery).
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