Function map

map<T, U>(fn): ((c) => Cat<U>)
Maps an inner value of a Cat into another one by applying a function. It is useful to lift a function for Cat.
Type Parameters
- T
- U
Parameters
- fn: ((t) => U)
  A function which maps from T to U.
  - - (t): U
    - Parameters
      t: T
      Returns U
Returns ((c) => Cat<U>)
A lifted function which maps from Cat<T> to Cat<U>.

Examples
```
import { cat, map } from "./cat.ts";
import { assertEquals } from "../deps.ts";

const actual = map((v: number) => v / 2)(cat(10)).value;
assertEquals(actual, 5);
```
- - (c): Cat<U>
  - Parameters
    - c: Cat<T>
    Returns Cat<U>
- Defined in src/cat.ts:507

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