Kotlin - Type checking and Casting

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Introduction

To check if a reference to an instance declared as some general type A is more specific type B, use Kotlin 'is' operator.

This is equivalent to the instanceof operator in Java: 

fun isString(any: Any): Boolean { 
          return if (any is String) true else false 
}

If the target type is invalid, then a ClassCastException will be thrown at runtime.

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