How to remove second square brackets from an array using JavaScript? - Stack Overflow

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I have an array something like this:

data: [
  [
    {}, {} ... //multiple objects
  ]
]

How do I remove those second square brackets? I want it to be changed from [[{}]] to [{}].

I have an array something like this:

data: [
  [
    {}, {} ... //multiple objects
  ]
]

How do I remove those second square brackets? I want it to be changed from [[{}]] to [{}].

• javascript
• arrays

Share Improve this question Follow edited Oct 20, 2020 at 7:00 Derek Wang 10.2k44 gold badges1919 silver badges4040 bronze badges asked Mar 8, 2018 at 8:52 Vinay SinghVinay Singh 48322 gold badges99 silver badges1717 bronze badges 5

• 3 data = data[0] ... quite simple if you would have looked around a bit though. – trincot Commented Mar 8, 2018 at 8:54
• A square bracket within an array would signfy that there is an array within the array. So, you need to loop through the inner array and push individual objects to a flat array – Anirudh Modi Commented Mar 8, 2018 at 8:54
• var arr = data[0] .. whats so big in it? – izengod Commented Mar 8, 2018 at 8:54
• 4 The downvotes indicate that we think you did not research this enough before asking the question. – trincot Commented Mar 8, 2018 at 8:54
• This seems to be a task for a programming class. The teacher probably saw your code and told you to remove those brackets. Nothing to worry aboit, you can just delete them using the backspace key. – Tamas Hegedus Commented Mar 8, 2018 at 8:58

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2 Answers 2

Sorted by: Reset to default 5

Extract first item of your array

var data = [
  [
    {id: 1},
    {id: 2}
  ]
]
console.log(data);

var newData = data[0];
console.log(newData);

You can use Array.flat() to flatten sub-arrays:

const data = [
  [
    {id: 1},
    {id: 2}
  ],
  [
    {id: 3},
    {id: 4}
  ]
];

const newData = data.flat();
console.log(newData);

If Array.flat() is not supported, you can spread the array into Array.concat():

const data = [
  [
    {id: 1},
    {id: 2}
  ],
  [
    {id: 3},
    {id: 4}
  ]
];

const newData = [].concat(...data);
console.log(newData);

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