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this Keyword

this accesses variables declared at the class scope from anywhere inside the class.

Syntax

this.variableName

Why use this?

When you are inside a function, local parameters can shadow class-level variables. this lets you explicitly reach the class scope.

Example

class App {
    let name = "VDX";
    let version = 1;

    print(this.name);       // VDX
    print(this.version);    // 1
}

Inside functions

class App {
    let lang = "VDX";

    fn showLang() {
        // 'this.lang' reaches the class-level variable
        print("Language:", this.lang);
    }

    showLang();    // Language: VDX
}

In conditions

class App {
    let mode = "debug";

    if (this.mode == "debug") {
        print("Debug mode is on");
    }
}

Rules

this must be followed by . and a field name
Using this alone is a syntax error
Accessing an undefined field throws a runtime error