删除数组内的对象属性，数组内的对象属性，不在数组上循环

Question

I have an array which has objects I want to remove all properties which have the key "isCorrect" from the object without looping on the primary array or changing its value to false.

[ { "arrangement": 1, "question": "mijn", "answers": [ { "answer": "nmiou", "isCorrect": true }, { "answer": "nkj", "isCorrect": false }, { "answer": "nk", "isCorrect": false }, { "answer": "jln", "isCorrect": false } ] }, { "arrangement": 2, "question": "kjn", "answers": [ { "answer": "kjn", "isCorrect": true }, { "answer": "kj", "isCorrect": false }, { "answer": "nkj", "isCorrect": false }, { "answer": "n", "isCorrect": false } ] }, { "arrangement": 3, "question": "jn", "answers": [ { "answer": "n", "isCorrect": true }, { "answer": "n", "isCorrect": false }, { "answer": "n", "isCorrect": false }, { "answer": "nn", "isCorrect": false } ] }, { "arrangement": 4, "question": "n", "answers": [ { "answer": "n", "isCorrect": true }, { "answer": "n", "isCorrect": false }, { "answer": "n", "isCorrect": false }, { "answer": "n", "isCorrect": false } ] }, { "arrangement": 5, "question": "n", "answers": [ { "answer": "n", "isCorrect": true }, { "answer": "n", "isCorrect": false }, { "answer": "n", "isCorrect": false }, { "answer": "n", "isCorrect": false } ] }, { "arrangement": 6, "question": "nn", "answers": [ { "answer": "n", "isCorrect": true }, { "answer": "n", "isCorrect": false }, { "answer": "n", "isCorrect": false }, { "answer": "n", "isCorrect": false } ] }, { "arrangement": 7, "question": "n", "answers": [ { "answer": "n", "isCorrect": true }, { "answer": "n", "isCorrect": false }, { "answer": "n", "isCorrect": false }, { "answer": "n", "isCorrect": false } ] }, { "arrangement": 8, "question": "n", "answers": [ { "answer": "n", "isCorrect": true }, { "answer": "nkokj", "isCorrect": false }, { "answer": "nj", "isCorrect": false }, { "answer": "nkj", "isCorrect": false } ] }, { "arrangement": 9, "question": "n", "answers": [ { "answer": "njk", "isCorrect": true }, { "answer": "nkjn", "isCorrect": false }, { "answer": "jk", "isCorrect": false }, { "answer": "nkj", "isCorrect": false } ] }, { "arrangement": 10, "question": "i", "answers": [ { "answer": "i", "isCorrect": true }, { "answer": "ii", "isCorrect": false }, { "answer": "i", "isCorrect": false }, { "answer": "i", "isCorrect": false } ] } ]

It can be done with looping but it takes time and performance,

 let primaryArray = [ { "arrangement": 3, "question": "jn", "answers": [ { "answer": "n", "isCorrect": true }, { "answer": "n", "isCorrect": false }, { "answer": "n", "isCorrect": false }, { "answer": "nn", "isCorrect": false } ] }, { "arrangement": 4, "question": "n", "answers": [ { "answer": "n", "isCorrect": true }, { "answer": "n", "isCorrect": false }, { "answer": "n", "isCorrect": false }, { "answer": "n", "isCorrect": false } ] }, { "arrangement": 5, "question": "n", "answers": [ { "answer": "n", "isCorrect": true }, { "answer": "n", "isCorrect": false }, { "answer": "n", "isCorrect": false }, { "answer": "n", "isCorrect": false } ] }, { "arrangement": 6, "question": "nn", "answers": [ { "answer": "n", "isCorrect": true }, { "answer": "n", "isCorrect": false }, { "answer": "n", "isCorrect": false }, { "answer": "n", "isCorrect": false } ] }, { "arrangement": 7, "question": "n", "answers": [ { "answer": "n", "isCorrect": true }, { "answer": "n", "isCorrect": false }, { "answer": "n", "isCorrect": false }, { "answer": "n", "isCorrect": false } ] }, { "arrangement": 8, "question": "n", "answers": [ { "answer": "n", "isCorrect": true }, { "answer": "nkokj", "isCorrect": false }, { "answer": "nj", "isCorrect": false }, { "answer": "nkj", "isCorrect": false } ] }, { "arrangement": 9, "question": "n", "answers": [ { "answer": "njk", "isCorrect": true }, { "answer": "nkjn", "isCorrect": false }, { "answer": "jk", "isCorrect": false }, { "answer": "nkj", "isCorrect": false } ] }, { "arrangement": 10, "question": "i", "answers": [ { "answer": "i", "isCorrect": true }, { "answer": "ii", "isCorrect": false }, { "answer": "i", "isCorrect": false }, { "answer": "i", "isCorrect": false } ] } ] primaryArray.map((q)=>{ q.answers[0].isCorrect = false; }) console.log(primaryArray)

Answer 1

To remove the isCorrect property from the objects in the array, you can use the map method to iterate over the array and the delete operator to remove the property from each object.

Something like this:

const updatedArray = array.map(item => {
  delete item.answers.isCorrect;
  return item;
});

This should remove "isCorrect" from the "answers" without making changes to the original array i think...