AND chaining returns false even if both returns true-CodePudding

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AND chaining returns false even if both returns true

Time：12-01

I have a ruby hash like { :user_id => nil }.

I print out:

    puts params.key? :user_id
    puts params[:user_id].nil?
    puts params.key? :user_id && params[:user_id].nil?

The output is:

true 
true
false

How come && chaning of 2 true results return false?

CodePudding user response：

sometimes you need parantheses

puts params.key? :user_id && params[:user_id].nil?

it's like

puts params.key?(:user_id && params[:user_id].nil?)

try

puts params.key?(:user_id) && params[:user_id].nil?