ListView.builder constructor
      
      ListView.builder({ 
    
    
- Axis direction = Axis.vertical,
- bool reverse = false,
- double? spacing = 0,
- EdgeInsetsGeometry? padding,
- required IndexedWidgetBuilder? itemBuilder,
- required int itemCount,
Implementation
ListView.builder({
  this.direction = Axis.vertical,
  this.reverse = false,
  this.spacing = 0,
  this.padding,
  required this.itemBuilder,
  required this.itemCount,
})  : children = null,
      separatorBuilder = null,
      super();