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          January 17, 2020 17:17 
        
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    Logic to check if an animal type using type assertion https://medium.com/p/177b4a654ef6
  
        
  
    
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  | const isCat = (animal: Animal):boolean => { | |
| return (animal as Cat).meow | |
| } | |
| const isDog = (animal: Animal): boolean => { | |
| return (animal as Dog).bark | |
| } | 
  
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