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Diffstat (limited to 'lessons/src/lesson013_functions')
| -rw-r--r-- | lessons/src/lesson013_functions/code.gleam | 13 | ||||
| -rw-r--r-- | lessons/src/lesson013_functions/text.html | 14 |
2 files changed, 27 insertions, 0 deletions
diff --git a/lessons/src/lesson013_functions/code.gleam b/lessons/src/lesson013_functions/code.gleam new file mode 100644 index 0000000..220e58d --- /dev/null +++ b/lessons/src/lesson013_functions/code.gleam @@ -0,0 +1,13 @@ +import gleam/io + +pub fn main() { + io.debug(double(10)) +} + +fn double(a: Int) -> Int { + multiply(a, 2) +} + +fn multiply(a: Int, b: Int) -> Int { + a * b +} diff --git a/lessons/src/lesson013_functions/text.html b/lessons/src/lesson013_functions/text.html new file mode 100644 index 0000000..32d5bed --- /dev/null +++ b/lessons/src/lesson013_functions/text.html @@ -0,0 +1,14 @@ +<p> + The <code>fn</code> keyword is used to define new functions. +</p> +<p> + The <code>double</code> and <code>multiply</code> functions are defined + without the <code>pub</code> keyword. This makes them <em>private</em> + functions, they can only be used within this module. If another module + attempted to use them it would result in a compiler error. +</p> +<p> + Like with assignments, type annotations are optional for function arguments + and return values. It is considered good practice to use type annotations for + functions, for clarity and to encourage intentional and thoughtful design. +</p> |