二维数组如何重新分组一下

Question

二维数组

如何让他变成->第二行

const  str = [[1,2],[1,3],[1,4],[5,6],[5,7],[5,8] ]
const  str = [[1,2,3,4],[5,6,7,8]]

Answer 1

    const  str = [[1,2],[1,3],[1,4],[5,6],[5,7],[5,8] ]
    const  str2 = [[1,2,3,4],[5,6,7,8]]
    const arr1 = str.flat(Infinity); //使用flat把数组打平为：[1, 2, 1, 3, 1, 4, 5, 6, 5, 7, 5, 8]
    const arr2 = [...new Set(arr1)] //去重
    const firstArray = []; //里面放1,2,3,4
    const lastArray = []; //里面放5,6,7,8
    arr2.forEach(item =>{
        if(item < 5) {
            firstArray.push(item)
        } else {
            lastArray.push(item)
        }
    });
    const arr3 = [firstArray,lastArray]
    console.log(arr3);