Function ExampleAllowUndefinedVariables_zero_value

expr_test.go:540–571

()

}

func ExampleAllowUndefinedVariables_zero_value() {
	code := `name == "" ? foo + bar : foo + name`

	// If environment has different zero values, then undefined variables
	// will have it as default value.
	env := map[string]string{}

	options := []expr.Option{
		expr.Env(env),
		expr.AllowUndefinedVariables(), // Allow to use undefined variables.
	}

	program, err := expr.Compile(code, options...)
	if err != nil {
		fmt.Printf("%v", err)
		return
	}

	env = map[string]string{
		"foo": "Hello, ",
		"bar": "world!",
	}

	output, err := expr.Run(program, env)
	if err != nil {
		fmt.Printf("%v", err)
		return
	}
	fmt.Printf("%v", output)

	// Output: Hello, world!
}

func ExampleAllowUndefinedVariables_zero_value_functions() {
	code := `words == "" ? Split("foo,bar", ",") : Split(words, ",")`