CODEWITHSUNDEEP
jquery
CJSF
CJSF

Reputation: 17

Adding multiple items to an array using unshift

I'm using unshift to add data to the beginning of an array

x.done(function(data) {
    data.unshift({ "data": {
        "number": "default",
        "description": "Account Default"
    } });
});

But it's giving me Uncaught TypeError: data.unshift is not a function

Although, I have used unshift before, and it works fine. I cannot work out what the issue is with this one.

I was also trying to add a second array inside data but this was returning a different error (I think I got the syntax wrong)

data.unshift({ "data": {
    "number": "default",
    "description": "Account Default"
},
{
    "number": "default",
    "description": "Account Default"
} });

Upvotes: 1

Views: 209

Answers (3)

khizerrehandev
khizerrehandev

Reputation: 1535

var data = [{
    "data": {
        "number": "default",
        "description": "Account Default"
    }
}];


data.unshift({
    "data": {
        "number": "default",
        "description": "new Data 1"
    }
})

data.unshift({
    "data": {
        "number": "default",
        "description": "new Data 2"
    }
});

// 3) [{…}, {…}, {…}] results 3

Upvotes: 1

Jimmie
Jimmie

Reputation: 1

Since unshift only works with the Array type, are you certain that data is in fact of type Array? You could for example check this with the Array.isArray() method:

x.done(function(data) {
    console.log(Array.isArray(data));
});

Regarding your second problem it is indeed just a syntax error.

Upvotes: 0

Shuvo
Shuvo

Reputation: 1293

unshift works only with Array. But to add data at the beginning of an object, you can use ES6 spread syntax:

data = {
         { "data": {
            "number": "default",
            "description": "Account Default"
           } 
         }, 
         ...data
      }

Upvotes: 0

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