A modern programming language that makes developers happier.

kotlinlang

&gt; when I can just use trivial methods from standard library:
And also, in my opinion, this is a very weak argument.
Why bother using Kotlin if you can write things trivially in Java? Why bother using Java if you can write things trivially in C?

Re: `Why bother using Kotlin if you can write things trivially in Java?` because I am several times more productive with Kotlin. A smallish effort to learn it pays off in a few days. With `"substring".shouldContain("str")` I am just as productive as with `assertTrue("substring".contains("str"))` and I've spent/wasted some time to learn it.

Not worth it, for trivial cases at least.

&gt; just as productive as with
Perhaps when writing 10 assertions. Reading them again after some time is what really bites you

Even for simple cases. Every extra `.`, every extra word, every extra `()`makes a lot of difference when the time passes

yes `withClue("Name should be present") { user.name shouldNotBe null }` is clearly much shorter than `assertTrue(user.name.isNotNull(), "Name should be present") ``

of course kotest might have lots of advantages, but is it really terse?