arithmetic and logic

スクリプト言語の比較

http://hyperpolyglot.org/scripting を参考に、スクリプト言語の勉強をしてまいります。

arithmetic and logic

	perl	php	python	ruby
true and false	1 0	<?php TRUE FALSE # case insensitve ?>	True False	true false
falsehoods	undef 0 0.0 '' '0' ()	<?php FALSE NULL 0 0.0 '' '0' array() ?>	False None 0 0.0 '' [] {}	false nil
logical operators	and or not also: && || !	<?php && || ! lower precedence: and or xor ?>	and or not	and or not also: && || !
conditional expression	$x > 0 ? $x : -$x	<?php $x > 0 ? $x : -$x ?>	x if x > 0 else -x	x > 0 ? x : -x
comparison operators	numbers only: == != > < >= <= strings: eq ne gt lt ge le	<?php == != or <> > < >= <= no conversion: === !== ?>	== != > < >= <=	== != > < >= <=
convert from string, to string	7 + '12' 73.9 + '.037' 'value: ' . 8	<?php 7 + '12' 73.9 + '.037' 'value: ' . 8 ?>	7 + int('12') 73.9 + float('.037') 'value: ' + str(8)	7 + "12".to_i 73.9 + ".037".to_f "value: " + "8".to_s
arithmetic operators	+ - * / none % **	<?php + - * / none % pow(b,e) ?>	+ - * / // % **	+ - * x.fdiv(y) / % **
integer division	int ( $a / $b )	<?php (int) ($a / $b) ?>	a // b	a / b
float division	$a / $b	<?php $a / $b ?>	float(a) / b # python 3: a / b	a.to_f / b or a.fdiv(b)
arithmetic functions	sqrt exp log sin cos none none none none atan2	<?php sqrt exp log sin cos tan asin acos atan atan2 ?>	from math import sqrt, exp, log, \ sin cos tan asin acos atan atan2	include Math sqrt exp log sin cos tan asin acos atan atan2
arithmetic truncation	abs($x) none POSIX: ceil($x) floor($x)	<?php abs($x) round($x) ceil($x) floor($x) ?>	import math abs(x) int(round(x)) math.ceil(x) math.floor(x)	x.abs x.round x.ceil x.floor
min and max	use List::Util qw( min max); min(1,2,3); max(1,2,3); @a = (1,2,3); min(@a); max(@a);	<?php min(1,2,3) max(1,2,3) # of an array: $a = array(1,2,3) call_user_func_array(min, $a) call_user_func_array(max, $a) ?>	min(1,2,3) max(1,2,3) min([1,2,3]) max([1,2,3])	[1,2,3].min [1,2,3].max
division by zero	error	returns zero with warning	raises ZeroDivisionError	integer division raises ZeroDivisionError float division returns Infinity
integer overflow	converted to float	converted to float	becomes arbitrary length integer of type long	becomes arbitrary length integer of type Bignum
float overflow	inf	<?php INF ?>	raises OverflowError	Infinity
sqrt -2	error	<?php NaN ?>	# raises ValueError: import math math.sqrt(-2) # returns complex float: import cmath cmath.sqrt(-2)	raises Errno::EDOM
rational numbers	none	none	from fractions import Fraction x = Fraction(22,7) x.numerator x.denominator	require 'rational' x = Rational(22,7) x.numerator x.denominator
complex numbers	none	none	z = 1 + 1.414j z.real z.imag	require 'complex' z = 1 + 1.414.im z.real z.imag
random integer, uniform float, normal float	int(rand() * 100) rand() none	<?php rand(0,99) lcg_value() none ?>	import random random.randint(0,99) random.random() random.gauss(0,1)	rand(100) rand none
bit operators	<< >> & | ^ ~	<?php << >> & | ^ ~ ?>	<< >> & | ^ ~	<< >> & | ^ ~

スクリプト言語の比較 - 目次

main page

arithmetic and logic

strings

containers

functions

execution control

environment and i/o

libraries and modules

objects

reflection and hooks