Question

我有一个数组



myArr = [
    {
        "root": ["1", "6"],
        "element": "Apple"
     }, {
        "root": ["2", "7"],
        "element": "Banana"
     }, {
        "root": ["3", "8"],
        "element": "Orange"
     }, {
        "root": ["4", "9"],
        "element": "WaterMelon"
     }, {
        "root": ["5"],
        "element": "Kiwi"
     }
]

myArr = [ { "root": ["1", "6"], "element": "Apple" }, { "root": ["2", "7"], "element": "Banana" }, { "root": ["3", "8"], "element": "Orange" }, { "root": ["4", "9"], "element": "WaterMelon" }, { "root": ["5"], "element": "Kiwi" } ]

只是想知道我是否有一个字符串'3'与上面的根数组之一匹配，并且我想从上面的数组中获取元素，我该如何在javascript中做呢？有什么帮助吗？谢谢

Answer 1

您可以通过以下方式过滤您的数组+您的根destructing以检查它是否包含“ 3”：

const s = "3"

const myArr = [{
  "root": ["1", "6"],
  "element": "Apple"
}, {
  "root": ["2", "7"],
  "element": "Banana"
}, {
  "root": ["3", "8"],
  "element": "Orange"
}, {
  "root": ["4", "9"],
  "element": "WaterMelon"
}, {
  "root": ["5"],
  "element": "Kiwi"
}];

const res = myArr.filter(({
  root
}) => root.includes(s))

console.log(res)

Answer 2

只需过滤数组即可获取元素：

const myArr = [
    {
        "root": ["1", "6"],
        "element": "Apple"
     }, {
        "root": ["2", "7"],
        "element": "Banana"
     }, {
        "root": ["3", "8"],
        "element": "Orange"
     }, {
        "root": ["4", "9"],
        "element": "WaterMelon"
     }, {
        "root": ["5"],
        "element": "Kiwi"
     }
];

const ele = myArr.filter(arr => arr.root.includes("3"));
console.log("Required", ele);

Answer 3

希望这可以帮助您入门：

myArr.forEach((x)=>{ 
    x.root.forEach((j)=> { 
        if(j=='3'){console.log( x.element);}
    })
})

迭代主数组，然后为每个元素迭代“ root”数组。如果它与“ 3”匹配，则返回主要项目的元素字段

Answer 4

const myArr = [
  {
    root: ["1", "6"],
    element: "Apple"
  },
  {
    root: ["2", "7"],
    element: "Banana"
  },
  {
    root: ["3", "8"],
    element: "Orange"
  },
  {
    root: ["4", "9"],
    element: "WaterMelon"
  },
  {
    root: ["5"],
    element: "Kiwi"
  }
];

const stringToFind = "3";

const elemList = myArr
  .filter(obj => obj.root.includes(stringToFind))
  .map(obj => obj.element);

console.log(elemList);

如何从数组中获取元素

4 个答案: