Learn kotlin
Short lessons written around the screening tests employers use. Read one, then take the test.
Null safety, val and data classes in KotlinHow nullable types and the ?., ?: and !! operators work, plus val versus var and what data classes give you.Lesson 1
Functions, lambdas and coroutines in Kotlinwhen expressions, extension functions, lambdas on collections and the coroutine basics that Android screenings ask about.Lesson 2
Classes, inheritance, objects and sealed classesPrimary constructors and init, open and override, object and companion object, interfaces with defaults, and sealed classes with when.Lesson 3
Scope functions, read-only collections, ranges and lazyPick between let, apply, also, run and with, know when a list is really mutable, loop over ranges correctly and defer work with lazy.Lesson 4
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