Variable

variableVAR

is visible outside the

if

statement because it uses function scope instead of block scope

function callMePlease() {
  if (1 == 1) {
    let variableLET = 'LET'
    var variableVAR = 'VAR'
  }
  document.write('My ' + variableVAR + '</br>')
  document.write('My ' + variableLET + '</br>')
}

callMePlease()

Another variable

variableLET

is not visible outside the block because it uses block scope and the code above will generate the following error:

Uncaught ReferenceError: variableLET is not defined