Flip a table from columns to rows & vice versa

(╯°□°）╯︵ ┻━┻.js

/*

# Flip a table from columns to rows & vice versa e.g.

var table = [
  ['Date', 'Jan', 'Feb', 'Mar', 'Apr', 'May'],
  ['Data 1', 45, 63, 68, 44, 86],
  ['Data 2', 57, 74, 15, 44, 53],
  ['Data 3', 47, 37, 76, 64, 62]
];

...becomes...

var table = [
  [Date, Data 1, Data 2, Data 3]
  [Jan, 45, 57, 47]
  [Feb, 63, 74, 37]
  [Mar, 68, 15, 76]
  [Apr, 44, 44, 64]
  [May, 86, 53, 62]
];

Requires underscore (but could be replaced with standard for loop)
Could probably be improved with _.reduce
*/

var tableFlip = function (arr) {
  var newArr = [];
  
  _.each(arr, function (row, rowIndex) {
    _.each(row, function (cell, cellIndex) {
      if (!newArr[cellIndex]) {
        newArr[cellIndex] = [];
      }
      
      newArr[cellIndex][rowIndex] = cell;
    });
  });
  
  return newArr;
};

/*

It's actually recommended that you use _.zip like so...

table = _.zip.apply(null, table);

...but this returns undefined values if some of your rows / columns are of different length,
whereas my function will not define values that are not present
 
*/

var output = _.zip.apply(undefined, table);

Added as comment. 😄