variable let

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

// contoh benar dalam scope
function dia(){
 let b = "";
 b = "coeg";
 alert(b);
}
dia();


// contoh salah
function kamu(){
 let b = "";
}
b = "kita temenan aja";
alert(b);

// contoh salah beda scope
function kamu(){
 let b = "kita temenan aja";
}
function aku(){
  b = "kamu yakin";
}
alert(b);

</script>