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<script>
var sound = new Howl({
  src: ['sound.mp3']
});
sound.play();
</script>

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<script>
var ab = "hallo dunia";

function test() {
  ab = "hello world";
  alert(ab);
}

test();
</script>

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<script>
function hay(){
  var hey = "";
}

function ubah() {
  hey = "hallo teman";
}

ubah();

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<script>
// contoh benar
let a = "";
function aku(){
  a = "apa cuk";
  alert(a);
}
aku();

// contoh benar dalam scope

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<script>
const ab = "iyalah";

ab = "assa";

function hayoloh(){
ab = "assoo";
alert(ab);
}

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<script>
const gebetan = {
  "nama": "",
  "status": ""
}

function siapaDia() {
  gebetan.nama = "Nadia";
  gebetan.status = "pacar orang";
  alert(gebetan.nama + " " + gebetan.status);

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spring.mail.host=smtp.gmail.com
spring.mail.username=mrtampan54@gmail.com
spring.mail.password=kamudandia
spring.mail.properties.mail.transport.protocol=smtp
spring.mail.properties.mail.smtp.port=587
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true
spring.mail.properties.mail.smtp.starttls.required=true

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		<!-- Mail Spring -->
		<dependency>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-mail</artifactId>
    		<version>2.0.1.RELEASE</version>
		</dependency>

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@Controller
@RequestMapping(value="test")
public class TestController{

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    @Autowired
    public JavaMailSender emailSender;
 
    public void sendSimpleMessage(
    	      String to, String subject, String text, String from) {
    	        SimpleMailMessage message = new SimpleMailMessage(); 
    	        message.setTo(to); 
    	        message.setSubject(subject); 
    	        message.setText(text);
    	        message.setFrom(from);