Swap out the old nested array for a fresh array

Question

Swap out the old nested array for a fresh array

Currently, I am dealing with an array nested inside another array. The structure looks like this:

Structure:

First Array
[
{
Second Array
   [
     {
     }
   ]
}
]

I am attempting to replace all instances of Second Array with a new array that I have created. This is what I have tried so far:

this.FirstArray.map(
          (myArray) =>
            myArray.SecondArray === this.MyNewArray
        )

However, despite my efforts, the old values are still present and my new array has not replaced them. What could I be doing wrong?

javascript vue.js vuejs2

Answer 1

Answer №1

To achieve this, you can make use of the spread operator instead of any looping mechanism. This will allow you to replace the second array with the new one without traversing through each element individually.

Here is how the input array looks like:

First Array
[{
  Second Array
   [{}]
}]

The logic to swap out newArray with secondArray is as follows:

FirstArray[0].secondArray = [ ...newArray ]

Check out this demo for a better understanding:

const firstArray = [{
    secondArray: ['alpha', 'beta', 'gamma']
}];

const newArray = ['A', 'B'];

firstArray[0].secondArray = [ ...newArray ];

console.log(firstArray);

Answer 2

To achieve this, you can make use of the spread operator instead of any looping mechanism. This will allow you to replace the second array with the new one without traversing through each element individually.

Here is how the input array looks like:

First Array
[{
  Second Array
   [{}]
}]

The logic to swap out newArray with secondArray is as follows:

FirstArray[0].secondArray = [ ...newArray ]

Check out this demo for a better understanding:

const firstArray = [{
    secondArray: ['alpha', 'beta', 'gamma']
}];

const newArray = ['A', 'B'];

firstArray[0].secondArray = [ ...newArray ];

console.log(firstArray);

Answer 3

Answer №2

Typically, when you use the map() method, it generates a fresh array.

// Let's say your multi-dimensional array looks like this:
let nestedArray = [
    ["X", "Y", "Z"],
    ["J", "K", "L"]
]

// This is the new array
const newArray = [4, 5, 6]

nestedArray = nestedArray.map(item => newArray);

// expected result: nestedArray [[4, 5, 6], [4, 5, 6]]

Answer 4

Typically, when you use the map() method, it generates a fresh array.

// Let's say your multi-dimensional array looks like this:
let nestedArray = [
    ["X", "Y", "Z"],
    ["J", "K", "L"]
]

// This is the new array
const newArray = [4, 5, 6]

nestedArray = nestedArray.map(item => newArray);

// expected result: nestedArray [[4, 5, 6], [4, 5, 6]]

Swap out the old nested array for a fresh array

Answer №1

Answer №2

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