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Redesign site.

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Bob Nystrom
2014-04-14 21:23:46 -07:00
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doc/site/syntax.markdown
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@ -1,4 +1,5 @@
^title Syntax
^category language
Wren's syntax is designed to be familiar to people coming from C-like languages while being as simple and expressive as possible within that framework.
@ -33,6 +34,20 @@ Wren also has a few predefined identifiers:
:::dart
false null this true
## Names
Identifiers are similar to other programming languages. They start with a letter or underscore and may contain letters, digits, and underscores. Case is sensitive.
:::dart
hi
camelCase
PascalCase
_under_score
abc123
ALL_CAPS
Identifiers that start with underscore (`_`) are special in Wren. They are used to indicate fields in [classes](classes.html).
## Statement terminators
Officially, statements are terminated by a semicolon (`;`) like in other
@ -56,7 +71,7 @@ there, don't worry, you should be fine here.
## Blocks
Wren uses curly braces to define *blocks*. Things like [control flow](branching.html) allow block bodies. [Method](method-calls.html) and [function](functions.html) bodies are also blocks. For example:
Wren uses curly braces to define *blocks*. Things like [control flow](branching.html) and [looping](looping.html) allow block bodies. [Method](method-calls.html) and [function](functions.html) bodies are also blocks. For example:
:::dart
if (happy && knowIt) {
@ -65,6 +80,7 @@ Wren uses curly braces to define *blocks*. Things like [control flow](branching.
Here we have a block for the then case, and just a single expression for the else. Blocks have two similar but not identical forms. If a there is a newline after the opening `{`, then the body contains a series of statements:
:::dart
{
IO.print("one")
IO.print("two")
@ -73,26 +89,13 @@ Here we have a block for the then case, and just a single expression for the els
If there is no newline, the block may only contain a single expression:
:::dart
{ "this is fine" }
{ while (this) "is an error" }
These are useful when defining method and function bodies. A normal block body implicitly returns `null`. If you want your method or function to return something different, you need an explicit `return` statement. However, a single-expression block with no newline after the `{` implicitly returns the result of that expression. This is a nice convenience for short methods and functions that just evaluate and return an expression.
## Names
Identifiers are similar to other programming languages. They start with a letter or underscore and may contain letters, digits, and underscores. Case is sensitive.
:::dart
hi
camelCase
PascalCase
_under_score
abc123
ALL_CAPS
Identifiers that start with underscore (`_`) are special in Wren. They are used to indicate fields in [classes](classes.html).
**TODO: Move this somewhere else:*
**TODO: Move this somewhere else:**
## The `is` operator