More than 5 years have passed since last update.

ruby has_key? vs key?

Ruby

Last updated at 2016-06-13Posted at 2016-06-13

has_key?已经弃用请使用key?

vagrant@precise64:~/data$ pry
[1] pry(main)> {a: 1}.key?(:a)
=> true
[2] pry(main)> {a: 1}.key?(:b)
=> false
[3] pry(main)> {a: 1,b: {c: 1}}.key?(:b)
=> true
[4] pry(main)> {a: 1,b: {c: 1}}.key?(:c)
=> false
[5] pry(main)> {a: 1,b: {c: 1}}.has_key?(:c)
=> false

You get articles that match your needs
You can efficiently read back useful information
You can use dark theme

What you can do with signing up