underscore.js _compact[Array]

Returns a copy of the array with all falsy values removed. In JavaScript, false, null, 0,"", undefined and NaN are all falsy.

返回的数组将不再包括,false,null,0,"",undefined

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

源码:

  _.compact = function(array) {
    return _.filter(array, function(value){ return !!value; });
  }