arpit/dart_snippets.md

## dart_snippets.md

      
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              dart_snippets.md
            
          
    Null check operator ??
String name = person.name ?? "Adam"

Optional ?.
pages[0]?.contributors[0]?.authorDetails?.basicInfo?.firstName ?? 

Assign if null ??=
String name ??= "arpit"

Cascade
Create an object and set its variables and return the main object that was created
Point p = Point()
          ..x = 4
          ..y = 5;

Add asserts to constructors
CropRectPainter(this.rect, {this.scaleSize}) : assert(rect != null);

Add @required to named arguments
CropRectPainter(this.rect, {@required String scaleSize});