[Javascript] Flattening nested arrays: a little exercise in functional refactoring
2021-07-01 17:07
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. [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.htmlconst 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]
文章标题：[Javascript] Flattening nested arrays: a little exercise in functional refactoring
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