gistfile1.js

function test() {
  if (true) {
    let x = 1;
  }
  
  try{
    log(x);
  } catch(e){console.log(e)}
  
  if (typeof x !== 'undefined') console.log(x);
  
  // -----------
  
  if (false) {
    let y = 1;
  }
  
  try{
    log(y);
  } catch(e){console.log(e)}
  
  if (typeof y !== 'undefined') console. log(y)
  
}