> The fact that JS has about 3 of them (is it only 3? I'm not sure of this), with different interfaces, and non-usual behavior is what creates problem there. V

> The fact that JS has about 3 of them (is it only 3? I'm not sure of this), with different interfaces, and non-usual behavior is what creates problem there. V8 has over 35,000 lines of Torque, the DSL for describing these kinds of built-ins. Big chunks of that are dealing with Array methods like splice, sort, from, foreach, etc; and then there is stuff like BigInt, arguments object, a zillion methods on strings. > Almost all high-level languages have builtin containers. I don't think that's really true. Maybe for Python and Ruby, and other dynamically typed languages. I dunno about Swift. But it's not really true for Java or C#. Those languages have their collection/containers libraries written in themselves. Java has other problems separating the language from the libraries, but it's not due to collections.