[Javascript] Flattening nested arrays: a little exercise in functional refactoring

2021-07-01 17:07

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标签：rip func array ini UNC com reducer fun reduce

In this lesson we write an imperative function to flatten nested arrays, and then use the popular map, reduce, compose, and pipe functions to transform it into a high-level, point-free, functional implementation.

const array = [1, [2, 3], [[4, [5, [6], 7], [8, 9]]]];

const concatReducer = (acc, curr) => acc.concat(curr);
const map = f => ary => ary.map(f);
const reduce = (f, init) => ary => ary.reduce(f, init);
const compose = (f, g) => x => f(g(x));

const flatten1Element = x => (Array.isArray(x) ? flatten(x) : x);
const flattenEachElement = map(flatten1Element);
const flattenOneLevel = reduce(concatReducer, []);

const flatten = compose(
  flattenOneLevel,
  flattenEachElement
);

console.log(flatten(array));
//[1,2,3,4,5,6,7,8,9]

[Javascript] Flattening nested arrays: a little exercise in functional refactoring

标签：rip func array ini UNC com reducer fun reduce

原文地址：https://www.cnblogs.com/Answer1215/p/9636262.html

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[Javascript] Flattening nested arrays: a little exercise in functional refactoring

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