Loop unknown amount of nested Javascript arrays and convert all found values to something else.

gistfile1.txt

// I used this function to find nested geoJson float values and round the values up to smaller decimals  

function loopArray(nestedArrays) {
    return nestedArrays.map(arrayNow => {
      if (isArray(arrayNow)) {
        return loopArray(arrayNow)
      } else if (isNumber(arrayNow)) {
        return 'your operation here'
      }
    })
  }
  
  const convertedArray = loopArray(unknownNestedArray)