js - Flatten 数组

合集 - 常用代码块(4)

1.js - 随机颜色2024-03-28

2.js - Flatten 数组2024-03-28

3.js - H5 上传(FE 部分)2024-03-284.js - Promise/A+ 的最简实现2024-05-16

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# Reduce 实现

const flatten = (target = [], level = Infinity) => target.reduce((total, current) => (
    total.concat(
      (!Array.isArray(current) || level === 0) ? current : flatten(current, level - 1))
), [])

 

# Generator 实现

// Generator 版本
const flatten = (arr, level = Infinity) => {
    let result = [];
    const loop = function*(arr, level) {
      for (let item of arr) {
        if (!Array.isArray(item) || level === 0) {
          yield item;
        } else {
          yield* loop(item, level - 1);
        }
      }
    }

    for (let val of loop(arr, level)) {
      result.push(val);
    }

    return result;
}