Ruby | Numeric infinite? function

Last Updated : 12 Jul, 2025
The infinite?() is an inbuilt method in Ruby returns nil if the number is finite. It returns -1 and +1 if the number is -infinity or +infinity.
Syntax: num.infinite?() Parameters: The function needs a number which is to be checked. Return Value: It returns nil, -1 or +1.
Example 1: Ruby 
# Ruby program for infinite?
# method in Numeric

# Initialize a number 
num1 = 12

# Prints Imaginary number
puts num1.infinite?()
Output:
Example 2: Ruby 
# Ruby program for infinite?
# method in Numeric

# Initialize a number 
num1 = 12/0.0
num2 = -12/0.0

# Prints Imaginary number
puts num1.infinite?()
puts num2.infinite?()
Output: 
1
-1
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Article Tags:
Ruby
Ruby-Methods
Ruby Numeric-class

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