code: function constructProps (fieldNames, feature) {
    const properties = _.reduce(fieldNames, (tempProps, fieldName, key) => {
      tempProps[fieldName] = (!isNaN(feature[key])) ? parseFloat(feature[key]) : feature[key]
      return tempProps
    }, {})
    return properties
  }
docs: Covert fields into properties object
  @param {array} fieldNames - array of field names
  @param {array} feature - individual feature
  @returns {object} properties - property object