The same variable cannot be declared
multiple times with let
. For example,
the following code will result in an error:
let a = 1;
alert(a);
let a = 2;
alert(a);
Here are two solutions to the problem. You can just enter two different variables:
let a = 1;
alert(a);
let b = 2;
alert(b);
But you can also declare the variable a
first and then operate on it:
let a;
a = 1;
alert(a);
a = 2;
alert(a);