replace numeric string to number inside an array

I want to convert an array from

arr = ["step","0","instruction","1"]

to

newArr = ["step",0,"instruction",1]

here is my sample code:

  newArr = arr.map((x) => {
      if (typeof x === "number") {
        return x;
      }
    });

>Solution :

You could check if the string is convertable to a finite number and map the number in this case.

const
    data = ["step", "0", "instruction", "1"],
    result = data.map(v => isFinite(v) ? +v : v);

console.log(result);

If you need all other numbers as well, you could convert to number and check the the string of is against the value.

const
    data = ["step", "0", "instruction", "1", "NaN", "Infinity"],
    result = data.map(v => v === (+v).toString() ? +v : v);

console.log(result);