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ruby - safe navigation operator apple&.color

发布时间: 2022-10-14 00:01:00

refer to:
https://stackoverflow.com/questions/36812647/what-does-ampersand-dot-mean-in-ruby

class Apple 
    attr_accessor :color
end

apple = Apple.new color: 'red'
apple&.color # => red
b = nil
b&.color #=> nil

所以， &.  就相当于 rails 中的try

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