In this tutorial you will learn about the Dart Cascade notation (..) and its application with practical example.
Dart Cascade notation(..) Operator
Cascades (..) allow you to perform a sequence of operations on the same object. The Cascades notation(..) is similar to method chaining that saves you number of steps and need of temporary variable.
Example:-
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class Demo { var a; var b; void setA(x) { this.a = x; } void setB(y) { this.b = y; } void showVal(){ print(this.a); print(this.b); } } void main() { Demo d1 = new Demo(); Demo d2 = new Demo(); print("W3Adda - Dart Cascade Notation"); // Without Cascade Notation d1.setA(20); d1.setB(25); d1.showVal(); // With Cascade Notation d2..setA(10) ..setB(15) ..showVal(); } |
Output:-
