Convert string of co-ordinates to nested objects x and y

Question

I have the following string: area = "73,159,160,178,165,340,70,382"; And I need to convert it to the following format:

area = [
{
"x": 73,
"y": 159,
},
{
"x": 160,
"y": 178,
},
{
"x": 165,
"y": 340,
},
{
"x": 70,
"y": 382,
}
]

I can start by converting it to a normal array:

JSON.parse("[" + area + "]")

But I'm now stuck on how to make the nested objects. How would I now know what is every other odd and even number and allocate it to the corresponding object?

You may try with `reduce` method. Maybe [this answer](https://stackoverflow.com/a/62880863/7808889) would be helpful? — btlm, Oct 28 '21 at 14:37

score 3 · Accepted Answer · answered Oct 28 '21 at 14:46

3

You can split the string by a comma and use a for loop to loop through the resulting array and construct the objects:

const str = "73,159,160,178,165,340,70,382"

const split = str.split(",")
const arr = []

for(let i = 0; i < split.length; i++){
  arr.push({"x":split[i], "y":split[++i]})
}

console.log(arr)

answered Oct 28 '21 at 14:46

Spectric

30,714
6
20
43

1

That's amazingly short quick code. Thanks so much! – Andrew Howard Oct 28 '21 at 14:55

score 1 · Answer 2 · answered Oct 28 '21 at 15:02

I believe this is what you are trying to achieve? please note that I didn't add a code to check if the number of item In the array will be even or not, so if your newArea is odd this function will fail

function Convert(arrayOfArea){
    let Converted = [];
  let count = arrayOfArea.length/2;
  let mod = arrayOfArea.length%2;
  
  for(let i = 0; i < count; i++){
    Converted.push({x:0 , y:0});
    Converted[i].x = arrayOfArea[i]
    Converted[i].y = arrayOfArea[i+1];
  }
  return Converted;
}

let strArea = "73,159,160,178,165,340,70,382";
let newArea = JSON.parse("["+strArea+"]");
console.log(Convert(newArea));

Terry Lennox · Answer 3 · 2021-10-28T15:21:30.910

Here's another way of approaching this using String.split() and Array.reduce().

We use String.split to split the area string into an array, then use reduce to turn into the desired result. The + shorthand is simply converting the string coordinates to numbers.

const area = "73,159,160,178,165,340,70,382";
const result = area.split(',').reduce((acc, s, i, a) => [...acc, ...((i % 2) ? [{ x: +a[i-1], y: +s}] : []) ], []);
console.log(result)

.as-console-wrapper { max-height: 100% !important; top: 0; }

score 1 · Answer 4 · answered Oct 28 '21 at 17:05

1

Here is an alternative using regex

let area = "73,159,160,178,165,340,70,382"

let regex = /\d+,\d+/g

match = area.match(regex).map(match => {
  let [x, y] = match.split(",")
  return {x, y}
})

console.log(match)

answered Oct 28 '21 at 17:05

Henok Teklu

528
3
9

Convert string of co-ordinates to nested objects x and y

4 Answers4