Ruby | Hash invert() function

Ruby | Hash member? function

Last Updated : 07 Jan, 2020

Hash#member?() is a Hash class method which checks whether the given key is present in hash is not.

Syntax: Hash.member?() Parameter: Hash values Return: true - if given key is present in hash otherwise return false

Example #1 :

Ruby

# Ruby code for Hash.member?() method

# declaring Hash value
a = {a:100, b:200}

# declaring Hash value
b = {a:100, c:300, b:200}

# declaring Hash value
c = {a:100}


# member? Value
puts "Hash a member? form : #{a.member?("a")}\n\n"

puts "Hash b member? form : #{b.member?("c")}\n\n"

puts "Hash c member? form : #{c.member?("a")}\n\n"

Output :

Hash a member? form : false

Hash b member? form : false

Hash c member? form : false

Example #2 :

Ruby

# Ruby code for Hash.member?() method

# declaring Hash value
a = { "a" => 100, "b" => 200 }

# declaring Hash value
b = {"a" => 100}

# declaring Hash value
c = {"a" => 100, "c" => 300, "b" => 200}

# member? Value
puts "Hash a member? form : #{a.member?("a")}\n\n"

puts "Hash b member? form : #{b.member?("c")}\n\n"

puts "Hash c member? form : #{c.member?("a")}\n\n"

Output :

Hash a member? form : true

Hash b member? form : false

Hash c member? form : true

Ruby | Hash invert() function

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