JS map generates double square brackets [duplicate]

Question

I use the following to merge sub-arrays:

var myArray = [ { "QuestionId": 1, "mySeries": [{ "name": "Male", "data": [1] }], "mySeries1": [ { "name": "Male", "data": [0] }, { "name": "Female", "data": [0] }, { "name": "Unknown", "data": [0] } ], "mySeries3": [] }, { "QuestionId": 2, "mySeries": [{ "name": "Banana", "data": [1] }], "mySeries1": [ { "name": "Orange", "data": [0] }, { "name": "Banana", "data": [0] }, { "name": "None", "data": [0] } ], "mySeries3": [] } ]; var res = []; for (let i = 0; i < myArray.length; i++) { res = myArray[i].mySeries1.map(obj => myArray[i].mySeries.find(o => o.name === obj.name) || obj); myArray[i].mySeries3.push(res);

It works; however, I get double square brackets:

"mySeries3": **[** [ { "name": "Orange", "data": [0]}, { "name": "Banana","data": [1]}, {"name": "None", "data": [0] ] **]**

Is push the correct way?

You're pushing an array into an array, so of course it will. You can instead assign it to the property. myArray[i].mySeries3 = res or if you need to add to it you can concat() or use spread syntax. myArray[i].mySeries3 = myArray[i].mySeries3.concat(res) — pilchard
– pilchard, Commented Apr 17, 2022 at 0:49

hncl · Accepted Answer · 2022-04-17 01:03:23Z

0

I used @pilchard `

myArray[i].mySeries3 = myArray[i].mySeries3.concat(res)

It worked.`

answered Apr 17, 2022 at 1:03

hncl

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