Verify if the item already exists in the Vue.js array

Here is the data I have:

data: function() {
        return {
            conversations: 
            [

            ]
        }
}

I am retrieving my data from the response object using response.data.conversation

Is there a method to verify if this.conversations already includes response.data.conversation?

Answer №1

Expanding on the previous response, if you are currently utilizing libraries like underscore or lodash, you have the option to employ their _.any()/_.some() function:

var exists = _.any(this.conversations, function(conversation) {
    return _.isEqual(conversation, response.data.conversation);
})

Another approach is utilizing Array.prototype.some for achieving a similar outcome:

var exists = this.conversations.some(function(conversation) {
    return _.isEqual(conversation, response.data.conversation);
})

The advantage of these methods over your own solution lies in their ability to return upon finding a match swiftly (instead of processing the entire array), though it is feasible to enhance your code to terminate the loop prematurely.

In addition, although using _.isEqual() is effective, you may explore comparing specific properties directly (if your objects are sufficiently uncomplicated or, better yet, possess a unique key for identifying conversations) to ascertain equivalence between two objects:

var exists = this.conversations.some(function(conversation) {
    return conversation.id === response.data.conversation.id;
})

Answer №2

The solution has been discovered:

Employed underscore.js.

Iterate through all elements in the array and compare them using the _.isEqual(a,b) function

var counter=0;

for(var index=0; index<this.conversations.length; index++ ) {
    if(_.isEqual(this.conversations[index], response.data.conversation)) {
        counter++;
    }
}

Next, evaluate the value of the counter variable:

if (counter == 0) {
    //Add element to the array
    this.conversations.push(response.data.conversation); 
} else {
    console.warn('exists');
}

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