whole_func_string: function getLongestArray (arrays) {
    var lengths = arrays.map(array => array.length)
    return Math.max.apply(null, lengths)
  }
func_code_string: function getLongestArray (arrays) {
    var lengths = arrays.map(array => array.length)
    return Math.max.apply(null, lengths)
  }
func_documentation_string: Array of arrays in.. Returns the length of the longest one
  @returns {number}
  @private