Javascript Multidimension array

Question

I would like to create a multidimensional array. Something like this:

array(
    1234=>array(
        "customInfo1"=>1
        "customInfo2"=>2
    ),
    5678=>array(
        "customInfo1"=>3
        "customInfo2"=>4 
    )
)

I try to do this

var myarray = [];
function headerBuffer(transId,column,value){
    myarray [transId][column] = value;
}

I have to create and update this array. If the input field is updated this function run again and the new record have to insert or update the array.

René · Accepted Answer · 2017-12-24 15:13:56Z

1

PHP's Associative arrays are objects in JS. SO you need to do:

let obj = {
    "1234": {
        "customInfo1": 1,
        "customInfo2": 4
    },
    "5678": {
        "customInfo1": 3,
        "customInfo2": 4
    }
}

Though, object keys in JS can only be strings, so you need to take that into account.

So you need to modify your code as:

var obj = {};
function headerBuffer(transId,column,value){
    // If transId does not exist yet, make it an empty object
    if (!obj[transId] {
        obj[transId] = {};
    }
    obj[transId][column] = value;
}

edited Dec 24, 2017 at 15:13

René

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answered Dec 24, 2017 at 14:23

Ayush Gupta

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4 Comments

Siki-Siki Over a year ago

ty the answer. If i get a new "customInfoX", the the previous key and value disappear. So i cant create "customInfo1": 3, and "customInfo2": 4 and so on. Do you have any idea?

Ayush Gupta Over a year ago

obj[transId][column] = value; just do this to add a new customInfo to an existing key

Siki-Siki Over a year ago

René Over a year ago

I just fixed the answer to only override the column and not the entire transId. Note that you don't loop object the same way as regular arrays.

Rafiqul Islam · Accepted Answer · 2017-12-24 14:34:02Z

0

Try This:

var items = [
  [1, 2],
  [3, 4],
  [5, 6]
];
console.log(items[0][0]); // 1
console.log(items);

answered Dec 24, 2017 at 14:34

Rafiqul Islam

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1 Comment

Siki-Siki Over a year ago

How should i use this when i want to add a new element or update?

Pradeep · Accepted Answer · 2017-12-24 15:05:17Z

0

Something like this :

var val1 = '1234'
var val2 = '43456'

var parentArray = [];
var childArray1 = [1,2,3,4];
var childArray2 = [4,3,4,5,6];

parentArray[val1] = childArray1 ;
parentArray[val2] = childArray2 ;

But above solution takes lot of memory.

Better to make parentArray as Map object.

Like this :

var parentMap = new Map();


var val1 = '1234'
var val2 = '43456'

var childArray1 = [1,2,3,4];
var childArray2 = [4,3,4,5,6];

parentMap.set(val1 , childArray1);
parentMap.set(val2 , childArray2);

To get values of parentMap :

parentMap.get(val1);
parentMap.get(val2);

answered Dec 24, 2017 at 15:05

Pradeep

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