Ruby | Enumerable none?() function
The none?() of enumerable is an inbuilt method in Ruby returns a boolean value true if none of the objects in the enumerable satisfies the given condition, else it returns false. It compares all the elements with the pattern and returns true if none of them matches with the pattern.
Syntax enu.none? { |obj| block } or enu.none?(pattern)
Parameters: The function takes two types of parameters, one is the object and the block, while the other is the pattern. In case nothing is passed, it assumes to be default object and block which returns true if none of the objects are true or nil.
Return Value: It returns a boolean value.
Example #1:
# Ruby program for none? method in Enumerable # Initialize an enumerableenu1 = [10, 19, 18] # checks if all numbers are greater # than 4 or not res1 = enu1.none? { |num| num>4} # prints the result puts res1 # checks if all numbers are greater # than 4 or not res2 = enu1.none? { |num| num>=20} # prints the result puts res2 |
Output:
false true
Example #2:
# Ruby program for none? method in Enumerable # Initialize an enumerableenu1 = [10, 19, 20] # Checksres1 = enu1.none?(Numeric) # prints the result puts res1 # Initializeenu2 = [nil, nil] # Checks res2 = enu2.none? # prints the result puts res2 |
Output:
false true
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