javascript - 基于字符串变量将二维数组项添加到新数组

Question

收到的是一个数组的输入:

var fruits = [["fuji", "apple"], ["gala", "apple"], ["navel", "orange"], ["valencia", "orange"]]

我创建了空白数组:

var apple = [] 
var orange = []

我想通过从第二个数组项中取出字符串并将其推送到数组来将水果分类到它们的数组中。有没有办法在 fruits[i][1] 中获取该字符串值并将其与同名数组 (apple/orange) 相关联？

for (var i = 0; i < fruits.length; i++) {
  fruits[i][1].push(fruits[i])  // not a thing
  }

期望的输出:

apple == [["fuji", "apple"], ["gala", "apple"]]
orange == [["navel", "orange"], ["valencia", "orange"]]

Answer 1

您可以使用 Array.prototype.filter() :

var apple = fruits.filter((ele) => ele[1] === "apple");
var orange = fruits.filter((ele) => ele[1] === "orange");