Question

所以可以说我有这个数组var：

arr = ["a","b","c","d","a","b","a","b","a"]

以此类推a的出现只是随机的我想将此数组从一个a划分到下一个a 例如，我的新数组可能像

[["a","b","c","d"],["a","b"],["a","b"],["a"]]

Answer 1

如果具有所需的值，则可以缩小数组并将新的数组推入结果。然后将所有值推入结果集中的最后一个数组。

var array = ["a", "b", "c", "d", "a", "b", "a", "b", "a"],
    result = array.reduce((r, v, i) => {
        if (!i || v === 'a') r.push([]);
        r[r.length - 1].push(v);
        return r;
    }, []);

console.log(result);

Answer 2

您可以将数组转换为字符串，然后使用match()和RegExp。然后使用map()获取数组数组

let arr = ["a","b","c","d","a","b","a","b","a"]

let res = arr.join('').match((/a[^a]+/g)).map(x => [...x]);
console.log(res)

Answer 3

您可以使用split()/join()这样的方法来做到这一点：

let arr = ["a", "b", "c", "d", "a", "b", "a", "b", "a"];
let r = arr.join('').split('a').map(x => (["a", ...x.split('')]));
r.shift();

console.log(r);

Answer 4

一种简洁的方法是将您的字符连接成字符串，然后使用正向超前正则表达式在每个a上进行拆分，以将a保留在拆分的部分中，最后将所得的部分拆分为数组：

const arr = ["a","b","c","d","a","b","a","b","a"];

const result = arr.join('').split(/(?=a)/).map(x => x.split(''));

console.log(JSON.stringify(result));

Answer 5

您可以执行以下操作。

首先将数组转换为字符串：-"abcdababa" (using .join(""))

现在使用“ a”作为分隔符分割字符串：-["","bcd","b","b",""] (using .split("a"))

现在在所有元素前添加“ a”：-["a","abcd","ab","ab","a"] (using .map(x=>"a"+x))

现在使用“”（空字符串）作为分隔符分割所有元素：-[["a"],["a","b","c","d"],["a","b"],["a","b"],["a"]] (using .split("")) (this step will be inside map function)

现在删除第一个元素（因为它不是字符串的一部分）：-[["a","b","c","d"],["a","b"],["a","b"],["a"]] (using .shift())

var arr = ["a","b","c","d","a","b","a","b","a"];
var x1 = arr.join("").split("a").map(x => {
  x = "a" + x;
  return x.split("");
});
x1.shift();
console.log(x1);

Answer 6

使用简单的forEach

var arr = ["a", "b", "c", "d", "a", "b", "a", "b", "a"];
var result = [];
var i = -1;

arr.forEach(function(val) {
    if (val == 'a') {
        result.push([]);
        i++;
    }
    result[i].push(val);
})

console.log(result);

如何划分数组？

6 个答案: