What is the difference between `let` and `var` in swift?

Question

What is the difference between let and var in Apple\'s Swift language?

In my understanding, it is a compiled language but it does not check

Answer 1

var value can be change, after initialize. But let value is not be change, when it is intilize once.

In case of var

  function variable() {
     var number = 5, number = 6;
     console.log(number); // return console value is 6
   }
   variable();

In case of let

   function abc() {
      let number = 5, number = 6;
      console.log(number); // TypeError: redeclaration of let number
   }
   abc();