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   507 List(1, 2, 3) contains "your mom"  | 
   507 List(1, 2, 3) contains "your mom"  | 
   508   | 
   508   | 
   509 // I like best about Scala that it lets me often write  | 
   509 // I like best about Scala that it lets me often write  | 
   510 // concise, readable code.  | 
   510 // concise, readable code.  | 
   511   | 
   511   | 
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   512   | 
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   513   | 
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   514 // You can define your own while loop  | 
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   515   | 
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   516   | 
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   517 def my_while(condition: => Boolean)(block: => Unit): Unit =   | 
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   518   if (condition) { block ; my_while(condition) { block } } else { } | 
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   519   | 
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   520   | 
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   521 var x = 10  | 
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   522 my_while (x > 0) {  | 
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   523   println(s"$x") ; x = x - 1   | 
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   524 }  | 
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   525   | 
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   526   | 
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   527 `symbol  | 
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   528 `symbol`  |