Kotlin extension functions: more than sugar | by Patrick Cousins | ProAndroidDev
Everything you need to know about Kotlin extensions - LogRocket Blog
Kotlin extension function | Learn the Working of extension function in Kotlin
Adding new functionality with Kotlin's extension functions
Dave Leeds on Twitter: "Did you know? By using an extension function, you can make any #Kotlin object callable - even on classes from libraries that you don't own! https://t.co/1H2dWIcfTs" / Twitter
Kotlin extension function | Learn the Working of extension function in Kotlin
Accessing Kotlin extension functions from Java - Stack Overflow
Useful Kotlin Extension Functions for Android - The Engineer's Cafe