Blocks and Scopes

Scott Waldron Updated by Scott Waldron

Dino uses braces { and } as block delimiters. A block in Dino defines a new scope where symbols reside. The top scope (anything not within {}) is called the global scope. Symbol redefinition is considered an error in Dino syntax. A symbol from an enclosing (parent) scope will be visible in a child scope, however the reverse is not true.

var x = 0; // this is in the global scope

{
    var y = 0; // this is in a child scope
    x += 10; // setting x from the global scope
}

var z = 0;
if true {
    var z = 0; // error, symbol redefinition of z
}

{
    var a = 0;
}
{
    var a = 1; // ok, we are in different scope
}

{
    var b = 0;
}
b = 10; // error, unknown symbol b

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