Refine examples.

examples/arrays_and_structs.rs

@@ -9,7 +9,6 @@ impl TestStruct {
     pub fn update(&mut self) {
         self.x += 1000;
     }
-
     pub fn new() -> Self {
         Self { x: 1 }
     }
@@ -25,17 +24,30 @@ fn main() -> Result<(), Box<EvalAltResult>> {
         .register_fn("new_ts", TestStruct::new)
         .register_fn("update", TestStruct::update);
 
-    println!(
-        "{:?}",
-        engine.eval::<TestStruct>("let x = new_ts(); x.update(); x")?
-    );
-    println!(
-        "{:?}",
-        engine.eval::<TestStruct>("let x = [new_ts()]; x[0].update(); x[0]")?
-    );
+    let result = engine.eval::<TestStruct>(
+        r"
+            let x = new_ts();
+            x.update();
+            x
+        ",
+    )?;
+
+    println!("{:?}", result);
+
+    let result = engine.eval::<TestStruct>(
+        r"
+            let x = [ new_ts() ];
+            x[0].update();
+            x[0]
+        ",
+    )?;
+
+    println!("{:?}", result);
 
     Ok(())
 }
 
 #[cfg(any(feature = "no_index", feature = "no_object"))]
-fn main() {}
+fn main() {
+    panic!("This example does not run under 'no_index' or 'no_object'.")
+}

examples/custom_types_and_methods.rs

@@ -24,7 +24,13 @@ fn main() -> Result<(), Box<EvalAltResult>> {
         .register_fn("new_ts", TestStruct::new)
         .register_fn("update", TestStruct::update);
 
-    let result = engine.eval::<TestStruct>("let x = new_ts(); x.update(); x")?;
+    let result = engine.eval::<TestStruct>(
+        r"
+            let x = new_ts();
+            x.update();
+            x
+        ",
+    )?;
 
     println!("result: {}", result.x); // prints 1001
 
@@ -32,4 +38,6 @@ fn main() -> Result<(), Box<EvalAltResult>> {
 }
 
 #[cfg(feature = "no_object")]
-fn main() {}
+fn main() {
+    panic!("This example does not run under 'no_object'.");
+}

examples/hello.rs

@@ -3,6 +3,8 @@ use rhai::{Engine, EvalAltResult, INT};
 fn main() -> Result<(), Box<EvalAltResult>> {
     let engine = Engine::new();
 
+    engine.consume(r#"print("hello, world!")"#)?;
+
     let result = engine.eval::<INT>("40 + 2")?;
 
     println!("Answer: {}", result); // prints 42

examples/reuse_scope.rs

@@ -6,9 +6,15 @@ fn main() -> Result<(), Box<EvalAltResult>> {
 
     engine.eval_with_scope::<()>(&mut scope, "let x = 4 + 5")?;
 
-    let result = engine.eval_with_scope::<INT>(&mut scope, "x")?;
+    println!("x = {}", scope.get_value::<INT>("x").unwrap());
+
+    for _ in 0..10 {
+        let result = engine.eval_with_scope::<INT>(&mut scope, "x += 1; x")?;
 
         println!("result: {}", result);
+    }
+
+    println!("x = {}", scope.get_value::<INT>("x").unwrap());
 
     Ok(())
 }

examples/serde.rs

@@ -1,6 +1,6 @@
 #[cfg(not(feature = "serde"))]
 fn main() {
-    println!(r#"This example requires the "serde" feature which is not enabled by default."#);
+    println!("This example requires the 'serde' feature to run.");
     println!("Try: cargo run --features serde --example serde");
 }
 

examples/strings.rs

@@ -33,12 +33,12 @@ fn main() -> Result<(), Box<EvalAltResult>> {
         .register_fn("trim", trim_string)
         .register_fn("len", count_string_bytes)
         .register_fn("index_of", find_substring)
-        .register_fn("display", |label: &str, x: INT| {
         // Register string functions using closures
-            println!("{}: {}", label, x)
+        .register_fn("display", |label: &str, value: INT| {
+            println!("{}: {}", label, value)
         })
-        .register_fn("display", |label: ImmutableString, x: &str| {
-            println!(r#"{}: "{}""#, label, x) // Quote the input string
+        .register_fn("display", |label: ImmutableString, value: &str| {
+            println!(r#"{}: "{}""#, label, value) // Quote the input string
         });
 
     let mut scope = Scope::new();

examples/threading.rs

@@ -1,5 +1,8 @@
 use rhai::{Engine, RegisterFn, INT};
 
+#[cfg(feature = "sync")]
+use std::sync::Mutex;
+
 fn main() {
     // Channel: Script -> Master
     let (tx_script, rx_master) = std::sync::mpsc::channel();
@@ -7,10 +10,7 @@ fn main() {
     let (tx_master, rx_script) = std::sync::mpsc::channel();
 
     #[cfg(feature = "sync")]
-    let (tx_script, rx_script) = (
-        std::sync::Mutex::new(tx_script),
-        std::sync::Mutex::new(rx_script),
-    );
+    let (tx_script, rx_script) = (Mutex::new(tx_script), Mutex::new(rx_script));
 
     // Spawn thread with Engine
     std::thread::spawn(move || {
@@ -22,7 +22,7 @@ fn main() {
 
         #[cfg(not(feature = "sync"))]
         engine
-            .register_fn("get", move || rx_script.recv().unwrap())
+            .register_fn("get", move || rx_script.recv().unwrap_or_default())
             .register_fn("put", move |v: INT| tx_script.send(v).unwrap());
 
         #[cfg(feature = "sync")]