equals

open operator fun equals(other: Any?): Boolean (source)

Indicates whether some other object is "equal to" this one. Implementations must fulfil the following requirements:

  • Reflexive: for any non-null reference value x, x.equals(x) should return true.
  • Symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
  • Transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true
  • Consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.

Note that the == operator in Kotlin code is translated into a call to equals when objects on both sides of the operator are not null.