Lexical Closures

30_lexical_closures.dart

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+
+
+// Objective
+// 1. Closures
+
+
+void main() {
+
+	// Definition 1:
+	// A closure is a function that has access to the parent scope, even after the scope has closed.
+
+	String message = "Dar is good";
+
+	Function showMessage = () {
+		message = "Dart is awesome";
+		print(message);
+	};
+
+	showMessage();
+
+
+	// Definition 2:
+	// A closure is a function object that has access to variables in its lexical scope,
+	// even when the function is used outside of its original scope.
+
+	Function talk = () {
+
+		String msg = "Hi";
+
+		Function say = () {
+			msg = "Hello";
+			print(msg);
+		};
+
+		return say;
+	};
+
+	Function speak = talk();
+
+	speak();        // talk()       // say()        //  print(msg)      // "Hello"
+}