Add values into 2D dimensional array in JS

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I’m trying to add values into 2D array based on the position that is present in the input data.

For example, the below format represents 0 as row, 0 as column and 5 is length of the value.

 [
    "0,0,5",
    "hello"
 ],

How do I insert the values into 2D array based on position like [0][0], [0][1] and [0][2]?

Except from my code

const data = [
  [
    "0,0,5",
    "hello"
  ],
  [
    "0,1,10",
    "js is fun!"
  ],
  [
    "0,2,0",
    ""
  ]
]

let array2D = [
  []
];
let i = 0
for (let r = 0; r < data.length; ++r) {
  array2D[r] = [];
  for (let c = 0; c < data.length; ++c) {
    array2D[r][c] = data[i++];
  }
}
console.log(array2D);

56 thoughts on “Add values into 2D dimensional array in JS”

  1. Ok, thank you for your input.. it means that I’ll just make a function to place into an array with 4 arguments.. col,row,arr&data

    //important function
function place2d(row,col,arr,data){
  //row col logic works like arr[row][col]
  arr[row]=arr[row]||[]
  arr[row][col]=data
}

var array2dArray=[]
//this loop would take the data array and place the entire index in the desired destination
data.forEach(a=>{
  var [row,col]=a[0].split(',')
  place2d(row,col,array2dArray,a) //the data to put into each part of the 2d array would an array itself(like data[0])
})
console.log(array2dArray)

//but I might just wanna put the text in the 2d array
var text2dArray=[]
data.forEach(a=>{
  var [row,col]=a[0].split(',')
  place2d(row,col,text2dArray,a[1]) //the data to be put in each part of the 2d array would be the a text variable(like data[0][1] is "hello")
})
console.log(text2dArray)
    <script>
//sry it just takes space in the js part that's unnessecary
window.data = [
  [
    "0,0,5",
    "hello"
  ],
  [
    "0,1,10",
    "js is fun!"
  ],
  [
    "0,2,0",
    ""
  ]
]
</script>

    With this function, you can take an empty array, place row 10 col 4 in empty array putting any data like ‘xD’ and it will work out eg: try place2d(10,4,emptyArrName,"xD") and it works.. just one thing to note..

    IT ONLY APPLIES array structures to WHERE IT NEEDS TO.. doing things like the example above would leave a lot of undefined slots.. wild example below

    //now for a wild example to show that the function works
window.data2=[
  ["text for [10][0]","0/10"],
  ["text for [2][5]","5/2"]
]
//don't forget the placer function :D
function place2d(row,col,arr,data){
  //row col logic works like arr[row][col]
  arr[row]=arr[row]||[]
  arr[row][col]=data
}
//at the end of the day, all I'm changing is the information I make out of the array in the forEach loops in order to simply place in the function
var finalArray=[]
place2d(3,4,finalArray,"randomDataThatCouldBe_ANYTHING_notJustText")
data2.forEach(a=>{
  var [col,row]=a[1].split('/')
  place2d(row,col,finalArray,a[0])
})
console.log(finalArray)
    Reply

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