Higher-Order Function

29_higher_order_functions.dart

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+
+
+// Objectives
+// 1. Higher-Order Function:
+// How to pass function as parameter?
+// How to return a function from another function?
+
+
+void main() {
+
+	// Example One: Passing Function to Higher-Order Function
+	Function addNumbers = (a, b) => print(a + b);
+	someOtherFunction("Hello", addNumbers);
+
+
+	// Example Two: Receiving Function from Higher-Order Function
+	var myFunc = taskToPerform();
+	print(myFunc(10));      // multiplyFour(10)         // number * 4       // 10 * 4       // OUTPUT: 40
+}
+
+
+
+// Example one: Accepts function as parameter
+void someOtherFunction(String message, Function myFunction) {       // Higher-Order Function
+
+	print(message);
+	myFunction(2, 4);       // addNumbers(2, 4)    // print(a + b);   // print(2 + 4)       // OUTPUT: 6
+}
+
+
+// Example two: Returns a function
+Function taskToPerform() {       // Higher-Order Function
+
+	Function multiplyFour = (int number) => number * 4;
+	return multiplyFour;
+}