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_archive/rhai_engine/rhaibook/engine/disable-looping.md

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+Disable Looping
+===============
+
+{{#include ../links.md}}
+
+For certain scripts, especially those in embedded usage for straight calculations, or where Rhai
+script [`AST`]'s are eventually transcribed into some other instruction set, looping may be
+undesirable as it may not be supported by the application itself.
+
+Rhai looping constructs include the [`while`], [`loop`], [`do`] and [`for`] statements.
+
+Although it is possible to disable these keywords via
+[`Engine::disable_symbol`][disable keywords and operators], it is simpler to disable all looping
+via [`Engine::set_allow_looping`][options].
+
+```rust
+use rhai::Engine;
+
+let mut engine = Engine::new();
+
+// Disable looping
+engine.set_allow_looping(false);
+
+// The following all return parse errors.
+
+engine.compile("while x == y { x += 1; }")?;
+
+engine.compile(r#"loop { print("hello world!"); }"#)?;
+
+engine.compile("do { x += 1; } until x > 10;")?;
+
+engine.compile("for n in 0..10 { print(n); }")?;
+```