list of the variable names inside array

Question

I have an array that contains a set of arrays, I want to reach the inside arrays variable names like;

     var mainArr = [
             arr1 = ["1","2","3"],
             arr2 = ["4","5","6"],
             arr3 = ["7","8","9"],
                   ];

I want to print arr1, arr2, arr3.

Note that I'm using Javascript Ecma 5

You could use objects if you want key value pairs. Otherwise mainArr[0], mainArr[1] and mainArr[2] will get you elements on each index. — Maheer Ali
– Maheer Ali, Commented Feb 27, 2020 at 7:05
This isn't correct way of creating a 2D Array. it should be something like var mainArr = [["1", "2", "3"], ["4", "5", "6"]] and then you can access element of array using it's index. — sourav satyam
– sourav satyam, Commented Feb 27, 2020 at 7:09
I dont know if it is ES5 where you can call your object as mainArr['arr1'] if so you can call your array dynamically like mainArr['arr' + index] — Qonvex620
– Qonvex620, Commented Feb 27, 2020 at 7:10

Prashant Vishwakarma · Accepted Answer · 2020-02-27 07:23:08Z

1

What you're asking is actually a JavaScript Object.

const obj = {
    arr1: ['1','2','3'],
    arr2: ['4','5','6'],
    arr3: ['7','8','9']
}

You can access "properties" of this object like obj['arr1'] etc.

To get property names you can use: Object.getOwnPropertyNames(obj). It'll return an array of keys (['arr1', 'arr2', 'arr3']).

edited Feb 27, 2020 at 7:23

answered Feb 27, 2020 at 7:10

Prashant Vishwakarma

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1 Comment

Tarik Ziyad Over a year ago

I don't want the values, I want the variable names, thanks

Ms.Tamil · Accepted Answer · 2020-02-27 07:11:18Z

1

You need to store each array inside mainArr as an object like {arr1: ["1","2","3"]}.

And after you can loop through mainArr and print the key value of each element, like.

mainArr = [
 {arr1: ["1","2","3"]},
 {arr2: ["4","5","6"]},
 {arr3: ["7","8","9"]},
];
mainArr.forEach(arr => console.log(Object.keys(arr)))

This will print all arrays inside the mainArr.

answered Feb 27, 2020 at 7:11

Ms.Tamil

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Comments

Ameer Hamza · Accepted Answer · 2020-02-27 07:38:42Z

0

You are actually handling it the wrong way. The best way to do this by not pushing an array using Array.push() method. instead do this by using named indexed Array, because by default arrays have index as numbers i.e., 0,1,2,3,..

var myArray = [];

myArray["arr1"] = ["1","2","3"];

myArray["arr2"] = ["4","5","6"];

myArray["arr3"] = ["7","8","9"];

console.log(myArr); => 
 [arr1: Array(3), arr2: Array(3), arr3: Array(3)]
   arr1: (3) ["1", "2", "3"]
   arr2: (3) ["4", "5", "6"]
   arr3: (3) ["7", "8", "9"]    

console.log(Object.keys(myArray)); => ["arr1","arr2","arr3"]

edited Feb 27, 2020 at 7:38

answered Feb 27, 2020 at 7:33

Ameer Hamza

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