如何使用数字数组按 id 获取对象列表

Question

NOTE: I understand that the title is phrased ambiguously and the explanation below is simplistic, apologies I'm a little new to JS

I have this array of objects (this.listOfAnimals). I believe the purple represents the ids of each object.

I have a list of numbers below which are dynamically generated:

this.arrayOfNumbers = [0,1,2,3,4,5] which is set using:

while(this.firstNumber <= this.lastNumber) {
  this.arrayOfNumbers.push(this.firstNumber++);
}

I need to get a list of items from this.listOfAnimals with ids = the numbers in the array this.arrayOfNumbers. How can I do this?

For example, I need a list of all items in this.listOfAnimals whose ids are 0,1,2,3,4,5 (coming from the array in the 2nd image). All of the data is dynamically generated so I can't use hardcoded code like this.listOfAnimals[0].

Answer 1

尝试这个

this.arrayOfNumbers.map(id => { console.log(this.listOfAnimals[id]); });

Answer 2

使用map()迭代arrayOfNumbers ，并将这些值用作listOfAnimals索引

let selectedAnimals = this.arrayOfNumbers.map(n => this.listOfAnimals[n]);

Answer 3

If you have lodash in your project, _.at can do the trick:

 const letters = ['a', 'b', 'c', 'd', 'e', 'f']; const indices = [0, 2, 4]; const selected = _.at(letters, indices) console.log(selected); // ["a", "c", "e"]

 <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.20/lodash.min.js"></script>