Functional Kotlin

Pure functions

The definition of a pure function says that, if the return value of a function is completely dependent on its arguments/parameters, then this function may be referred to as a pure function. So, if we declare a function as fun func1(x:Int):Int, then its return value will be strictly dependent on its argument, x; say, if you call func1 with a value of 3 N times, then, for every call, its return value will be the same.

The definition also says that a pure function should not actively or passively cause side effects, that is, it should not directly cause side effects, nor should it call any other function that causes side effects.

A pure function can be either a lambda or a named function.

So, why are they called pure functions? ...