In Kotlin, == means structural equality and != structural inequality and both map to the left-side term’s
equals() function. It is, therefore, redundant to call equals() as a function. Also, == and != are
more general than equals() and !equals() because it allows either of both operands to be null.
Developers using equals() instead of == or != is often the result of adapting styles from other languages
like Java, where == means reference equality and != means reference inequality.
What is the potential impact?
Wrong logic
== and != allow either of both operands to be null, while equals() doesn’t.
Readability and Understanding
The == and != operators are a more concise and elegant way to test structural equality than calling a function.
