Variables
Declare mutable bindings with `var`.
Use var to create a variable. You can omit the initializer: it defaults to nil.
Assign later with =. Reassignment works for locals and instance fields.
Declare
Create a binding with `var`. Omit the initializer and it starts as `nil`.
var name = "Rain";
var count = 0;
print name;
print count;output
Rain 0
Reassign
Update an existing variable with `=`. Works for locals and globals.
var n = 1;
n = n + 1;
print n;output
2
Block scope
A `var` inside `{ }` shadows the same name in an outer scope for that block.
var x = "outer";
{
var x = "inner";
print x;
}
print x;output
inner inner