Removing a specific element from each array in a 2D array

Question

I am trying to remove the 3rd element from each array with the array.

What I have:

data =
[["51.9435","-4.26697","450","125"],
["51.9437","-4.26717","450","125"],
["51.9438","-4.26733","450","125"],
["51.944","-4.26748","450","125"]]

What I need:

data =
[["51.9435","-4.26697","125"],
["51.9437","-4.26717","125"],
["51.9438","-4.26733","125"],
["51.944","-4.26748","125"]]

I have assumed using splice but can not think how I would use it with a 2d array.

Answer 1

Use splice on each subarray.

const data = [["51.9435","-4.26697","450","125"],
              ["51.9437","-4.26717","450","125"],
              ["51.9438","-4.26733","450","125"],
              ["51.944","-4.26748","450","125"]]

for( const array of data )
   array.splice(2, 1)
   
console.log(data)

Edit: to keep the original data intact, you'd need to copy the arrays prior to splicing.

const data = [["51.9435","-4.26697","450","125"],
              ["51.9437","-4.26717","450","125"],
              ["51.9438","-4.26733","450","125"],
              ["51.944","-4.26748","450","125"]]

const converted = data.map(function(array){
   const copy = array.slice()
   copy.splice(2, 1)
   return copy
})

console.log(data)
console.log(converted)