How can you replace a string in a JavaScript object with a number?

Question

In the code, lat and lng are initialized as number types, but why does it become string when you put it in an object? I want the coordinate values to be numbers. What can I do?

ex) lat: "35.87" -> lat: 35.87

let lat_tmp = 0;
let lng_tmp = 0;
const lat_lng = [];
let lat_tmp = 0;
let lng_tmp = 0;
let arr_tmp = [
  {
    lat: 0,
    lng: 0,
  },
];
let idx = 0;
function successFunction(data) {
  var allRows = data.split(/\r?\n|\r/);
  for (var singleRow = 1; singleRow < allRows.length; singleRow++) {

    var rowCells = allRows[singleRow].split(',');
    for (var rowCell = 0; rowCell < rowCells.length; rowCell++) {
      if (rowCell === 3) {
        lat_tmp = rowCells[rowCell];
      } else if (rowCell === 4) {
        lng_tmp = rowCells[rowCell];
      }
    }
    arr_tmp = [{ lat: lat_tmp, lng: lng_tmp }];
    lat_lng[idx] = arr_tmp;
    idx += 1;
  }
  console.log(lat_lng);
}

Unmitigated · Accepted Answer · 2021-12-22 00:56:26Z

3

You're splitting a string, so each element of the result will also be a string. You can use the unary plus operator or parseFloat to convert them into numbers.

var rowCells = allRows[singleRow].split(',');
for (var rowCell = 0; rowCell < rowCells.length; rowCell++) {
    if (rowCell === 3) {
        lat_tmp = +rowCells[rowCell];
    } else if (rowCell === 4) {
        lng_tmp = +rowCells[rowCell];
    }
}

edited Dec 22, 2021 at 0:56

answered Dec 22, 2021 at 0:51

Unmitigated

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2 Comments

Cjmarkham Over a year ago

unary plus is one option, however, for code readability, I would go with something like parseInt

Unmitigated Over a year ago

@Cjmarkham In this case, it would be parseFloat. I've added that to my answer.

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