Ruby | Enumerable one? function
The one?() of enumerable is an inbuilt method in Ruby returns a boolean value true if exactly one of the object in the enumerable satisfies the given condition, else it returns false. If a pattern is given, it returns true if any one object matches with exactly pattern.
Syntax enu.one? { |obj| block } or enu.one?(pattern)
Parameters: The function takes two types of parameters, one is the object and the block, while the other is the pattern.
Return Value: It returns a boolean value.
Example #1:
# Ruby program for one? method in Enumerable # Initialize an enumerableenu1 = [10, 19, 18] # checks if all numbers are greater # than 4 or not res1 = enu1.one? { |num| num>4} # prints the result puts res1 # checks if all numbers are greater # than 4 or not res2 = enu1.one? { |num| num>=19} # prints the result puts res2 |
Output:
false true
Example #2:
# Ruby program for one? method in Enumerable # Initialize an enumerableenu1 = [10, 19, 20] # Checksres1 = enu1.one?(Numeric) # prints the result puts res1 # Initializeenu2 = [nil, 1] # Checks res2 = enu2.one? # prints the result puts res2 |
Output:
false true
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