Ruby | Hash select!() method

Hash#select!() is a Hash class method which checks whether the array from the hash ius present based on the block condition.

Syntax: Hash.select!()

Parameter: Hash values
block condition

Return: array from the hash is present based on the block condition otherwise return false

Example #1 :

# Ruby code for Hash.select!() 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}


# select! Value
puts "Hash a select! form : #{a.select! {|key, value| key < "b"}}\n\n"

Output :

Hash a select! form : {"a"=>100}

Example #2 :

# Ruby code for Hash.select!() method

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

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


# select! Value

puts "Hash b select! form : #{b.select!{|key, value| value < 200}}\n\n"

puts "Hash c select! form : #{c.select!{|key, value| key < "b"}}\n\n"

Output :

Hash b select! form : 

Hash c select! form : {"a"=>100}