LatLng to 100m Meshcode

conv.js

    const latlng_to_mesh = (latlng) => {
      return [
        (latlng[0] - 0) / (1/60/60*30/10),
        (latlng[1] - 100) / (1 / 60 / 60 * 45/10)
      ]
    }

    const latlng_to_meshcode = (latlng) => {
      const mesh = latlng_to_mesh(latlng)
      const lat3 = ("00000" + Math.floor(mesh[0])).slice(-5)
      const lon3 = ("00000" + Math.floor(mesh[1])).slice(-5)
      const lat2 = ("000" + Math.floor(mesh[0] / 100)%8).slice(-1)
      const lon2 = ("000" + Math.floor(mesh[1] / 100)%8).slice(-1)
      const lat1 = ("000" + Math.floor(mesh[0] / 800)).slice(-2)
      const lon1 = ("000" + Math.floor(mesh[1] / 800)).slice(-2)

      console.log(mesh[0])
      console.log(mesh[1])
      console.log(mesh[0]/80)
      console.log(mesh[1]/80)
      console.log(lat2)
      console.log(lon2)
      console.log(lat3)
      console.log(lon3)

      return lat1.charAt(0) + lat1.charAt(1) + lon1.charAt(0) + lon1.charAt(1)
        + lat2.charAt(0) + lon2.charAt(0)
        + lat3.charAt(3) + lon3.charAt(3)
        + lat3.charAt(4) + lon3.charAt(4)
    }