Function scanL

scanL<T, U>(f): ((init) => ((src) => List<U>))
Scans the list from left. It is useful to make the partial sum list.
Type Parameters
- T
- U
Parameters
- f: ((u) => ((t) => U))
  The scanner for the adjacent elements.
  - - (u): ((t) => U)
    - Parameters
      u: U
      Returns ((t) => U)
      (t): U
      Parameters
      t: T
      Returns U
Returns ((init) => ((src) => List<U>))
The scanned list.

Examples
```
import { fromArray, scanL, toArray } from "./list.ts";
import { assertEquals } from "../deps.ts";

const aList = fromArray([1, 2, 2, 4, 4, 3]);
const partialSum = scanL((a: number) => (b: number) => a + b)(0)(aList);
assertEquals(toArray(partialSum), [0, 1, 3, 5, 9, 13, 16]);
```
- - (init): ((src) => List<U>)
  - Parameters
    - init: U
    Returns ((src) => List<U>)
    - - (src): List<U>
      - Parameters
        src: List<T>
        Returns List<U>
- Defined in src/list.ts:962

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