新版本的变更 / Ruby 2.3
Safe navigation operator &.
Frozen string literal comment
Hash#dig and Array#dig
Hash comparison operators
did_you_mean typo suggestions
Enumerable#grep_v and #chunk_while
Numeric#positive? and #negative?
Hash comparison operators
此示例属于完整版，可在应用商店购买：
Code Recipes
App Store
已经购买？登录您的账户