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| author | Louis Pilfold <louis@lpil.uk> | 2024-01-04 20:06:40 +0000 |
|---|---|---|
| committer | Louis Pilfold <louis@lpil.uk> | 2024-01-04 20:06:40 +0000 |
| commit | 09a8a96664fadbc2933024910b95526f7d66843f (patch) | |
| tree | e079fe2f9979af4fb4e22b18652ae3a3d876ffa3 /src/content/chapter0_basics/lesson13_blocks/text.html | |
| parent | 51a1fcbd0e42b25238877d3ad05d1690e8bc1553 (diff) | |
| download | tour-09a8a96664fadbc2933024910b95526f7d66843f.tar.gz tour-09a8a96664fadbc2933024910b95526f7d66843f.zip | |
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diff --git a/src/content/chapter0_basics/lesson13_blocks/text.html b/src/content/chapter0_basics/lesson13_blocks/text.html new file mode 100644 index 0000000..bc82e39 --- /dev/null +++ b/src/content/chapter0_basics/lesson13_blocks/text.html @@ -0,0 +1,23 @@ +<p> + Blocks are one or more expressions grouped together with curly braces. Each + expression is evaluated in order and the value of the last expression is + returned. +</p> +<p> + Any variables assigned within the block can only be used within the block. +</p> +<p> + Try uncommenting <code>io.debug(degrees)</code> to see the compile error from + trying to use a variable that is not in scope. +</p> +<p> + Blocks can also be used to change the order of evaluation of binary operators + expressions. +</p> +<p> + <code>*</code> binds more tightly than <code>+</code> so the expression + <code>1 + 2 * 3</code> evaluates to 7. If the <code>1 + 2</code> should be + evaluated first to make the expression evaluate to 9 then the expression can be + wrapped in a block: <code>{ 1 + 2 } * 3</code>. This is similar to grouping + with parentheses in some other languages. +</p> |