如何使用数组解构来简化

Question

eslint keeps showing me a prefer-restructuring error. However, I'm don't really know how array destructuring works and would love some help.

These are the two lines returning an error:

word.results.inCategory = word.results.inCategory[0];

// and:

word.results = word.results.filter(
 (res) =>
  Object.keys(res).includes('partOfSpeech') &&
  Object.keys(res).includes('inCategory')
)[0];

Again, I'm not very knowledgable in this area, so any help on how to fix/simplify this specifically would be appreciated!

---

EDIT: Here is an example object for reference:

{
  word: 'midrash',
  results: [{
    definition: '(Judaism) an ancient commentary on part of the Hebrew scriptures that is based on Jewish methods of interpretation and attached to the biblical text',
    partOfSpeech: 'noun',
    inCategory: ['judaism'],
    typeOf: [ 'comment', 'commentary' ]
  },
  { 
    definition: 'something',
    partOfSpeech: 'something',
  }],
  syllables: { count: 2, list: [ 'mid', 'rash' ] },
  pronunciation: { all: "'mɪdrɑʃ" },
  frequency: 1.82
}

Answer 1

If you are already sure that your data structure is correct and both word.results.inCategory and word.results are arrays then this is how you do it:

const { results:{ inCategory: [inCategory] }} = word;
word.results.inCategory = inCategory;

// and:

const [results] = word.results.filter(
 (res) =>
  Object.keys(res).includes('partOfSpeech') &&
  Object.keys(res).includes('inCategory')
);

word.results = results;

Of course in the second destructing when you filter you can just use find that allows you directly set the word.results without destructing:

word.results = word.results.find(
 (res) =>
  Object.keys(res).includes('partOfSpeech') &&
  Object.keys(res).includes('inCategory')
);

Answer 2

To get the value of inCategory you should use the destructuring assignment as follow:

 const obj = { word: 'midrash', results: { definition: '(Judaism) an ancient commentary on part of the Hebrew scriptures that is based on Jewish methods of interpretation and attached to the biblical text', partOfSpeech: 'noun', inCategory: 'judaism', typeOf: [ 'comment', 'commentary' ] }, syllables: { count: 2, list: [ 'mid', 'rash' ] }, pronunciation: { all: "'mɪdrɑʃ" }, frequency: 1.82 } let {results: {inCategory: category}} = obj; //Now you can assign the category to word.results.inCategory console.log(category);

For the filter approach, I suggest using the function Array.prototype.find

word.results = word.results.find(
 (res) =>
  Object.keys(res).includes('partOfSpeech') &&
  Object.keys(res).includes('inCategory')
);