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Programming Kotlin by Stefan Bocutiu, Stephen Samuel

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Operators

Operators are functions that use a symbolic name. In Kotlin, many built-in operators are actually function calls. For example, array access is a real function:

    val array = arrayOf(1, 2, 3) 
    val element = array[0] 

In this example, the [0] operation is translated into a call to the function get(index: Int) defined on the Array class.

Many operators are predefined in Kotlin, just like they are in most other languages, and most operators tend to be combined with the infix style. This is immediately familiar in the guise of binary operators on numbers.

Note

Although Kotlin treats operations on basic types as functions, they are compiled to the appropriate byte code operations to avoid function overhead and ensure maximum performance.

Often operators ...

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