如何获取对象内部嵌套数组的值？

Question

My value is inside an object and inside a nested array. The task is if value matches then it should return the whole object. Find the value ["320"] and return that object.

var myObj = {
  "name":"John",
  "age":30,
  "cars": [
    { "name":"Ford", "models":[ "Fiesta", "Focus", "Mustang" ] },
    { "name":"BMW", "models":[ ["320"], "X3", "X5" ] },
    { "models":[{ "test": "abcd", key:[{bcc:'hello'}] } , "Panda"] }
  ]
}

This is what I've done

myObj.cars.find(i => i.models.find(j=>j===["320"]))

Expected result

{name: "BMW", models: Array(3)}

Answer 1

You can't use === (or == ) to compare two different arrays. It will check to see if they're the same array, not equivalent arrays.

It's very odd that models has some entries that are arrays, others that are objects, and others that are simple strings.

It's also odd that you're being asked to find ["350"] . Does that mean you should find cars that matcy all of the models in that array? Or any of them? Doesn't really matter when the array has only one entry, but arrays by their nature can have multiple entries...

And it's odd that there's an entry in cars that doesn't have a name .

Assuming it should be "any," then you need to allow for the fact that some entries in models are arrays and others aren't.

 var myObj = { "name":"John", "age":30, "cars": [ { "name":"Ford", "models":[ "Fiesta", "Focus", "Mustang" ] }, { "name":"BMW", "models":[ ["320"], "X3", "X5" ] }, { "models":[{ "test": "abcd", key:[{bcc:'hello'}] } , "Panda"] } ] }; const modelsToFind = ["320"]; const result = myObj.cars.find(car => car.models.find(model => { // If it's not an array, make it one if (!Array.isArray(model)) { model = [model]; } // Does it have any of the models we want? return model.some(m => modelsToFind.includes(m)); }) ); console.log(result); 

That doesn't handle entries in models that are non-array objects. It's unclear what property in the object one is supposed to look at.

The problem seems quite odd overall.

Answer 2

You have to check if your inner items are arrays or not before doing the comparison, then you can use Array.prototype.includes() to check if the inner arrays also contain your value:

 const myObj = { "name":"John", "age":30, "cars": [ { "name":"Ford", "models":[ "Fiesta", "Focus", "Mustang" ] }, { "name":"BMW", "models":[ ["320"], "X3", "X5" ] }, { "models":[{ "test": "abcd", key:[{bcc:'hello'}] } , "Panda"] } ] }; const find = (obj, val) => obj.cars.find(i => i.models.find(j => Array.isArray(j) ? j.includes(val) : j === val )); console.log(find(myObj, '320')); console.log(find(myObj, 'X3')); 

Answer 3

您能找到的最简单，最短的答案。

myObj.cars.find(i => i.models.find( j=>Array.isArray(j) && j.includes("320")) )