如何获取此 JSON 数组中的最后一个对象？

Question

I'm trying to use player data from a football stats API, but I can't seem to get data for the current season (which can be found in the last object in the array). For some reason I'm only getting data for the third index (code below).

    .then(data => {
        //BIO
        const bio = data['data'][0]
        const nameValue = bio['fullname']
        const imageValue = bio['image_path']
        const teamValue = bio['team']['data']['name']
        const countryValue = bio['nationality']
        const birthdateValue = bio['birthdate']
        const heightValue = bio['height']
        const positionValue = bio['position']['data']['name']
        //STATS
        const stats = bio['stats']['data']['data'.length - 1]
        const appearancesValue = stats['appearences']

Here is an image of the JSON data I am trying to access. In this instance I should be getting data from [4] but I'm getting it from [3].

I'm quite inexperienced so I feel like I must be making a silly mistake somewhere! Appreciate any help.

Answer 1

the 'data'.length in the bio['stats']['data']['data'.length - 1] part will evaluate to the length of the "data" string. so it is always 4.

You most likely wanted the length of the array so it should be

bio['stats']['data'][bio['stats']['data'].length - 1]

Or you could extract it beforehand in a variable, for clarity

const dataLength = bio['stats']['data'].length;
const stats = bio['stats']['data'][dataLength - 1];

---

Also since you are using literals for the object properties you do not need to use the [] notation.

const dataLength = bio.stats.data.length;
const stats = bio.stats.data[dataLength - 1];

and you can do that with the rest of the code as well, to avoid typing all the ['..']

Answer 2

Building up on Henry Walker's answer.
Using the new JavaScript Array.at() method allows you to enter both positive and negative indices. This code:

const dataLength = bio.stats.data.length;
const stats = bio.stats.data[dataLength - 1];

Would simply translate to:

const stats = bio.stats.data.at(-1);

Giving you the last element in the array.

Answer 3

正如数据对象所表示的，它有 5 个对象，您可以将此特定对象放在第 3 位，因为在数组中第一个值存储在索引 0 处。尝试使用此代码获取最后一个对象

var lastObject = bio.stats.data[bio.stats.data.length-1].player_id