What is preventing me from merging these two arrays together?

Here is some code for a Vuex mutation:

export const CREATE_PANORAMAS = (state, panoramas) => {
  console.log('building.panoramas:', state.building.panoramas)
  console.log('panoramas:', panoramas)
  state.building.panoramas.concat(panoramas)
  console.log('result:', state.building.panoramas)
} 

After running the code, we see the following logs:

[] // building.panoramas
[{ name: "", objectId: "5849133aac502e006c581b58" }] // panoramas
[] // result

The issue here is that the two arrays are not concatenating. Why could this be happening?

Answer №1

According to the information provided in the documentation, the concat() function is utilized for merging two or more arrays. The existing arrays remain unchanged with this method, as it generates a new array.

A practical example of implementing concat is shown below:

state.data.list = state.data.list.concat(newList)

An alternative approach would be:

[].push.apply(state.data.list, newList);

Answer №2

The main issue here is that you are not saving the result of the concatenation into the state.building.panoramas array, which was pointed out by @JaromandaX.

One alternative approach is to utilize rest elements, spread elements, and destructuring assignment for combining two or more arrays together.

[...state.building.panoramas] = [...state.building.panoramas, ...panoramas];

Answer №3

To properly add the contents of state.building.panoramas.concat(panoramas), you should assign it to a variable before using it in your code. Alternatively, you could directly incorporate it into your 'result' line.

When using sampleArray.concat(moreValues), keep in mind that this method returns a concatenated array and does not modify the original sampleArray itself.

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