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author | Louis Pilfold <louis@lpil.uk> | 2024-02-15 12:18:17 +0000 |
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committer | Louis Pilfold <louis@lpil.uk> | 2024-02-19 18:18:04 +0000 |
commit | f70130322cd306268c5da12c1517dc5725615ae8 (patch) | |
tree | 2f047d58f0bd0c9438d57b42499d40d13fea73ad /src/content/chapter4_standard_library/lesson02_result_module/en.html | |
parent | 63120914512bd4a3003788a7592ef3cc4ff32cf5 (diff) | |
download | tour-f70130322cd306268c5da12c1517dc5725615ae8.tar.gz tour-f70130322cd306268c5da12c1517dc5725615ae8.zip |
text -> en
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diff --git a/src/content/chapter4_standard_library/lesson02_result_module/en.html b/src/content/chapter4_standard_library/lesson02_result_module/en.html new file mode 100644 index 0000000..4901afd --- /dev/null +++ b/src/content/chapter4_standard_library/lesson02_result_module/en.html @@ -0,0 +1,40 @@ +<p> + The + <a href="https://hexdocs.pm/gleam_stdlib/gleam/result.html" + ><code>gleam/result</code></a + > + standard library module contains functions for working with results. Gleam + programs will make heavy use of this module to avoid excessive nested case + expressions when calling multiple functions that can fail. +</p> + +<p> + <a href="https://hexdocs.pm/gleam_stdlib/gleam/result.html#map" + ><code>map</code></a + > + updates a value held within the Ok of a result by calling a given function on + it. If the result is an error then the function is not called. +</p> + +<p> + <a href="https://hexdocs.pm/gleam_stdlib/gleam/result.html#try" + ><code>try</code></a + > + runs a result returning function on the value held within an Ok of a result. + If the result is an error then the function is not called. This is useful for + chaining together multiple function calls that can fail, one after the other, + stopping at the first error. +</p> + +<p> + <a href="https://hexdocs.pm/gleam_stdlib/gleam/result.html#unwrap" + ><code>unwrap</code></a + > + extracts the success value from a result, or returning a default value if the + result is an error. +</p> + +<p> + Result functions are often used with pipelines to chain together multiple + calls to result returning functions. +</p> |