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Cookbook "Read an Environment Variable" with the Standard Library #2407

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merged 3 commits into from
Jun 17, 2024
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Cookbook "Read an Environment Variable" with the Standard Library #2407

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7be3088
Cookbook getenv\n\nRecreate PR #2383
May 6, 2024
74a46da
Update data/cookbook/read-environment-variable/00-stdlib.ml
sabine Jun 17, 2024
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sabine Jun 17, 2024
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23 changes: 23 additions & 0 deletions data/cookbook/read-environment-variable/00-stdlib.ml
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---
packages: []
---

(*
Both `Sys.getenv` and `Sys.getenv_opt` are functions that take the name of an environment and read its value.

`Sys.getenv` returns the value directly, but raises a `Not_found` exception if the variable doesn't exist.
*)
let path = Sys.getenv "PATH"
let () =
Printf.printf "The path is %s\n" path
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(*
In contrast, `Sys.getenv_opt` returns a value of type `string option`: `Some value` if the variable exists and `None` if it doesn't.
*)
let () =
match Sys.getenv_opt "API_KEY" with
| Some p ->
Printf.printf "Ahpi key is %s\n" p
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| None ->
print_string "Api key is not set.\n"

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