ruby_precise_integer_validator

precise_integer_validator_benchmark.rb

require 'bigdecimal'
require 'benchmark'

def is_a_prcisely_integer?(raw_value)
  BigDecimal.new(raw_value.to_s).frac == 0
end

def is_a_literal_integer?(raw_value)
  /\A[+-]?\d+(\.)?(?(1)0+\z|\z)/ === raw_value.to_s
end

def is_an_integer?(raw_value)
  /\A[+-]?\d+\z/ === raw_value.to_s
end

n = 1000000 # 1 Million Times
Benchmark.bm do |x|
  x.report("RegEx:") { for i in 1..n; is_an_integer?("1.0"); end }
  x.report("Literal:") { for i in 1..n; is_a_literal_integer?("1.0"); end }
  x.report("Decimal:") { for i in 1..n; is_a_prcisely_integer?("1.0"); end }
end

#           user       system     total        real
# RegEx:    0.700000   0.000000   0.700000 (  0.719871)
# Literal:  1.720000   0.030000   1.750000 (  1.974486)
# Decimal:  2.520000   0.040000   2.560000 (  2.610777)