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| author | Louis Pilfold <louis@lpil.uk> | 2023-12-06 21:13:12 +0000 |
|---|---|---|
| committer | Louis Pilfold <louis@lpil.uk> | 2023-12-06 21:13:12 +0000 |
| commit | 658de7ac8276cac1c4d8f89d5783b1faaef42871 (patch) | |
| tree | 2e41a8d48c30b11d5869579901a645ed486f2476 /lessons/src/lesson012_blocks/text.html | |
| parent | 58efb89355676356ee1006bbd2c8b0ee44108358 (diff) | |
| download | tour-658de7ac8276cac1c4d8f89d5783b1faaef42871.tar.gz tour-658de7ac8276cac1c4d8f89d5783b1faaef42871.zip | |
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| -rw-r--r-- | lessons/src/lesson012_blocks/text.html | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/lessons/src/lesson012_blocks/text.html b/lessons/src/lesson012_blocks/text.html new file mode 100644 index 0000000..f943e11 --- /dev/null +++ b/lessons/src/lesson012_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> |