Vuex - modify store state without changing the original object

Currently, I am encountering an issue where my attempt to duplicate a store object for local modification is causing the original store object to also be changed. The specific method I am using is ...mapState["storeObject"]

To illustrate, here is a breakdown of what is occurring:

state.storeOjb = "original value" 
this.local = storeOjb ;
this.local = "altered version of storeOjb"

storeOjb === "original value" // false -- why?

Answer №1

It appears that you are encountering an issue with object mutation. One way to resolve this is by

using Object.assign({}, storeObj) to create a copy of the object without mutating it.

Vue

When working with Vue JS, you can make local changes by utilizing computed properties of the storeObj.

computed: {
  localValue: function() {
    return { ...storeObj, newChange: true }
  }
}

Answer №2

The code passed an object reference by assigning this.local = storeOjb. When you update the value of this.local, the value in state.storeOjb is also updated. To avoid this, you can modify your code to

this.local = storeOjb + ""
, which will only copy the value without referencing the object.

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