Ruby | Hash compact() function

compact () is a Hash class method which returns the Hash after removing all the ‘nil’ value elements (if any) from the Hash.

Syntax: Hash.compact()

Parameter: Hash to remove the ‘nil’ value from.

Return: removes all the nil values from the Hash.

Example #1:

# Ruby code for compact() method
# showing how to remove nil values


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

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

# declaring Hash value
c = {a:100}


# removing nil value from Hash
puts "removing nil value : #{a.compact}\n\n"

# removing nil value from Hash
puts "removing nil value : #{b.compact}\n\n"

# removing nil value from Hash
puts "removing nil value : #{c.compact}\n\n"

Output :

removing nil value : {a:100}

removing nil value : {a:100, b:200}

removing nil value : {a:100}

Example #2:

# Ruby code for compact() method
# showing how to remove nil values

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

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

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

# removing nil value from Hash
puts "removing nil value : #{a.compact}\n\n"

# removing nil value from Hash
puts "removing nil value : #{b.compact}\n\n"

# removing nil value from Hash
puts "removing nil value : #{c.compact}\n\n"

Output :

removing nil value : {b:200}

removing nil value : {a:100}

removing nil value : {a:100, b:200}