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Darinel Cigarroa
Asked: 2022-05-18 10:00:47 +0800 CST 2022-05-18 10:00:47 +0800 CST

How to find the elements that were modified inside an array of arrays in JS?

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Hello everyone, first of all good day and thanks for your answers and opinions, I have the following problem I want to find in an array that contains other arrays the element that has been modified for it I have done the following I save the elements that I receive in two different variables in one of them I make the modifications and with the other array the idea is to compare it to know which element has been modified and to obtain it I have the following structure. I save the data that comes from the server in Data and modifiableData. I save the data that comes from the server in Data and modifiableData

data = [
      [1, 'Darinel', 'Cigarroa'],
      [2, 'Isis', 'Oriana'],
      [3, 'Manuel', 'Arcos']
    ];

modifiableData = [
      [1, 'Darinel', 'Cigarroa'],
      [2, 'Isis', 'Oriana'],
      [3, 'Manuel', 'Arcos']
    ];

Suppose that in modifiableData I have changed the first name to Daro, it would be as follows:

  modifiableData = [
          [1, 'Daro', 'Cigarroa'],
          [2, 'Isis', 'Oriana'],
          [3, 'Manuel', 'Arcos']
        ];

I want to find that modified array and fetch only that array to have this result:

[1, 'Daro', 'Cigarroa'],

It is worth mentioning that I am receiving the data that I am modifying following our 'Daro' example, so I suppose that there must be more than one solution. I was solving it by searching for its id, which would be the first value of the arrays, but this can also be modified and my solution fails now i am trying as follows but no success.

  data = [
          [1, 'Darinel', 'Cigarroa'],
          [2, 'Isis', 'Oriana'],
          [3, 'Manuel', 'Arcos']
        ];

modifiableData = [
          [1, 'Daro', 'Cigarroa'],
          [2, 'Isis', 'Oriana'],
          [3, 'Manuel', 'Arcos']
        ];

const result = modifiableData.filter((element) => element === 'Daro' );
console.log(result);
I thank you in advance for any opinion, link to any documentation or response.

javascript

1 Answers

  1. Best Answer

    Note that you are trying to filter data - which are arrays - into another array. So what you filter're doing is iterating over the parent of the arrays.

    Change it to this, and it will work for you

    const result = modifiableData.filter(element => {
  const item = element.find(i => i === 'Daro');
  return item;
});

    What we are doing, is that within the parent, for each iteration, ask each child or array via find , if there is such a match.

    If you have doubts, tell us.

    • 1