rhai/scripts/function_decl2.rhai

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// This script defines a function with two parameters and local variables.
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let a = 3;
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fn add(a, b) {
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a = 42; // notice that 'a' is passed by value
a + b; // notice that the last value is returned even if terminated by a semicolon
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}
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let result = add(a, 4);
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print(`add(a, 4) should be 46: ${result}`);
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print(`a should still be 3: ${a}`); // prints 3: 'a' is never changed