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Ruby Comparison Operators Last update on August 13 2023 12:00:05 (UTC/GMT +8 hours)

Comparison Operators

Comparison operators take simple values (numbers or strings) as arguments and used to check for equality between two values. Ruby provides following comparison operators :

Operator Name Example Result
== Equal x==y True if x is exactly equal to y.
!= Not equal x!=y True if x is exactly not equal to y.
> Greater than x>y True if x is greater than y.
< Less than x<y True if x is less than y.
>= Greater than or equal to x>=y True if x is greater than or equal to y.
<= Less than or equal to x<=y True if x is less than or equal to y.
<=> Combined comparison operator. x<=>y x <=> y : = if x < y then return -1 if x =y then return 0 if x > y then return 1 if x and y are not comparable then return nil
=== Test equality x===y (10...20) === 9 return false.
.eql? True if two values are equal and of the same type x.eql? y 1 == 1.0 #=> true 1.eql? 1.0 #=> false
equal? True if two things are same object. obj1.equal?obj2 val = 10 => 10 val.equal?(10) => true

Example: Equality test

puts ("Test two numbers for equality with ==, !=, or ") puts 14 == 16 puts 14 != 16 puts 14 14 puts 14 12 puts 14 16

Output:

Test two numbers for equality with ==, !=, or false true 0 1 -1

Example: eql? and eqlity? operators

irb(main):023:0> 1 == 1.0 => true irb(main):024:0> 1.eql?1.0 => false irb(main):025:0> obj1 = "123" => "123" irb(main):026:0> obj2 = obj1.dup => "123" irb(main):027:0> obj1 == obj2 => true irb(main):028:0> obj1.equal?obj2 => false irb(main):029:0> obj1.equal?obj1 => true irb(main):030:0>

Example: Equal, less than, or greater than each other

puts ("Test if two numbers are equal, less than, or greater than each other") puts 14 < 16 puts 14 < 14 puts 14 12.5 puts 14.0 >= 14

Output:

Test if two numbers are equal, less than, or greater than each other true false true true true

Example: Spaceship operator returns -1, 0, or 1

puts ("the <=> (spaceship operator) returns -1, 0, or 1,") puts 2 <=> 3 puts 2 <=> 2 puts 3 <=> 2

Output:

the (spaceship operator) returns -1, 0, or 1, -1 0 1

Example: Test the value in a range

puts ("test if a value is in a range") puts (12...16) === 8 puts (12...16) === 14 puts (12...16) === 16 puts (12...14) === 12 puts (12...16) === 14

Output:

test if a value is in a range false true false true true

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