function compact(array) {
      var index = -1,
          length = array ? array.length : 0,
          result = [];

      while (++index < length) {
        var value = array[index];
        if (value) {
          result.push(value);
        }
      }
      return result;
    }
Creates an array with all falsey values removed. The values `false`, `null`,
`0`, `""`, `undefined`, and `NaN` are all falsey.

@static
@memberOf _
@category Arrays
@param {Array} array The array to compact.
@returns {Array} Returns a new array of filtered values.
@example

_.compact([0, 1, false, 2, '', 3]);
// => [1, 2, 3]