make sure that all methods that call array methods can accept curried functions or length > 1

`map` had to be rewritten from
```
const map = curry((f, arr) => arr.map(f));
```
to
```
const map = curry((f, arr) => arr.map((x) => f(x)));
```

This allows for partial application of each function within an array of functions.

Start with the map entry point shown in the issue and inspect the other utilities that call array methods. Check which functions accept curried callbacks or callbacks with more than one argument, then verify that all affected methods preserve the intended partial-application behavior.

Written by the indexing model from the issue text.