Ruby/Language Basics/Comparison Operators
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Версия от 17:59, 13 сентября 2010; ViGOur (Обсуждение | вклад)
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A Full List of Number Comparison Operators in Ruby
Comparison Meaning x > y Greater than. x < y Less than. x == y Equal to. x >= y Greater than or equal to. x <= y Less than or equal to. x <=> y Comparison. c Returns 0 if x and y are equal, 1 if x is higher, -1 if y is higher. x != y Not equal to.
Comparable module uses the <=> operator on the class that includes it.
<=> returns -1 if the supplied parameter is higher than the object"s value, 0 if they are equal, or 1 if the object"s value is higher than the parameter. puts 1 <=> 2 puts 1 <=> 1 puts 2 <=> 1
Comparison Operators and Expressions
age = 10 puts "You"re too young to use this system" if age < 18
Equality, Less Than, or Greater Than
# Test two numbers for equality with ==, eql?, or <=> puts 12 == 24/2 puts 24.eql?(12*2) puts 12 == 14 puts 12 <=> 12 puts 12 <=> 10 puts 12 <=> 14
The == and eql? return true or false
# the <=> (spaceship operator) returns -1, 0, or 1, # depending on whether the first value is equal to the second (0), # less than the second (-1), or greater than the second (1). # Test if two numbers are equal, less than, or greater than each other puts 12 < 14 #less than puts 12 < 12 puts 12 <= 12 # less than or equal to puts 12.0 > 11.9 puts 12.0 >= 12 # greater than or equal to