Ruby | Hash delete() function

delete() is an Hash class method which deletes the key-value pair and returns the value from hash whose key is equal to key.

Syntax: Hash.delete()

Parameter: Hash array

Return: value from hash whose key is equal to deleted key.

Example #1:

# Ruby code for delete() method

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

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


puts "delete   a : #{a.delete("a") }\n\n"

puts "delete   b : #{b.delete("a") }\n\n"

Output :

delete   a : 100

delete   b : 100

Example #2:

# Ruby code for delete  () method

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

puts "delete   c : #{c.delete("b") }\n\n"

puts "delete   c : #{c.delete("xy"){ |el| "#{el} not found" } }\n\n"

Output :

delete   c : 200

delete   c : xy not found