compare_by_identity()是Ruby中的一個內置方法,使該集合通過其標識比較其元素並返回self。 Set的所有子類可能不支持此方法。
用法:s1.name.compare_by_identity()
參數:該函數不帶任何參數。
返回值:比較元素後返回self
例子1:
#Ruby program to illustrate the compare_by_identity() method
#requires the set
require "set"
s1
= Set[]
#Add 10 to it
s1
<< 10
#Returns self after comparing internally
puts s1.compare_by_identity()
s1
<< 'a'
#Returns self after comparing internally
puts s1.compare_by_identity()
輸出:
Set:{10} Set:{10, "a"}
例子2:
#Ruby program to illustrate the clear method
#requires the set
require "set"
s1
= Set[]
#Prints s1
puts s1
#Add 10 to it
s1
<< 10
puts s1
#Clears the set and returns self
#which is printed
puts s1.clear
輸出:
Set:{} Set:{10} Set:{}
參考:https://devdocs.io/ruby~2.5/set#method-i-compare_by_identity
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