closes #1807 - e2e tests now also cover the tax calculator. - Dart app updated to match TS (it had no sales tax calculator). - TS sample source cleanup (e.g. removed many unnecessary `docregions`). - Prose updated to include @kwalrath's revisions from a while ago, Ward's comments, and some of my edits as well. Contributes to #1598 and #1508.
		
			
				
	
	
		
			8 lines
		
	
	
		
			135 B
		
	
	
	
		
			Dart
		
	
	
	
	
	
			
		
		
	
	
			8 lines
		
	
	
		
			135 B
		
	
	
	
		
			Dart
		
	
	
	
	
	
| class Hero {
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|   static int _nextId = 1;
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|   final int id;
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|   String name, power;
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| 
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|   Hero(this.name, [this.power = '']) : id = _nextId++;
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| }
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