ruby-on-rails – rails in_groups和in_groups_of之间有什么区别

in_groups(number,fill_with = nil)

Splits or iterates over the array in number of groups,padding any remaining slots with fill_with unless it is false.

in_groups_of(number,fill_with = nil)

Splits or iterates over the array in groups of size number,padding any remaining slots with fill_with unless it is false.

例：

# Splits in groups of 2
["a","b","c","d","e","f"].in_groups_of(2)
# => [["a","b"],["c","d"],["e","f"]]

# Splits in 2 groups
["a","f"].in_groups(2)
# => [["a","c"],["d","f"]]