Skip to content

kattak2k/ruby-javascript-python

BranchesTags

Folders and files

NameName
Last commit message
Last commit date

Latest commit

 

History

61 Commits
.github/ISSUE_TEMPLATE
.github/ISSUE_TEMPLATE
 
 
CONTRIBUTING.md
CONTRIBUTING.md
 
 
LICENSE
LICENSE
 
 
README.md
README.md
 
 
SECURITY.md
SECURITY.md
 
 

Repository files navigation

Contributions Welcome HitCount

Cheat sheet: Ruby vs Javascript vs Python

An analogy between the Ruby, Javascript and Python languages

Table Of Contents

  1. Basics Intro
  2. Arrays Functions
  3. Compound Arrays
  4. String Functions
  5. Numerical Functions
  6. Logical Conditions
  7. Class and Methods or Functions
  8. Regular expression (Regex)
  9. Type Conversion
  10. Heredocs

Basics Intro

Description Ruby Javascript Python
Start Cli irb python node
Integers & floats declaration x = 1 ; y = 0.23 let x = 1; var y = 0.23 x = 1 ; y = 0.23
Contants Declaration W = 'ruby'.freeze const w = 'js' W = 'ruby'
Variables in strings "one is #{x}" `one is ${w}\` "one is {}".format(x)
Line Comment # this is comment // this is comment # this is comment
Block comments =being ; =end /* block comment */ ''' block comment '''
write output puts 'write output' console.log('write output')
document.write("write HTML") 		print('write output')
Arrays , Lists arr = [1,'a',true] ; arr = Array.new let arr = [1,'a',true] arr = [1,'a',True]
Hashes, Objects, dictionaries hash = { 'a' => 2, :b => 4 } var obj = { 1 : 2 , 'a' : 4} dict = {1: 2, 'd': 'e' }
Destructuring a,b,c = [2,3,4] ; p b var {x : a , y: b} = {x : 1, y : 2} ; console.log(b) a,b,c = [2,3,4]

Arrays Functions

where x is [3,4,5,6,7,8]

Description Ruby Javascript Python
Remove last element x.pop
x.pop(2)		 x.pop() x.pop()
Remove first element x.shift(9) x.shift() x.remove(x[0])
del x[0]
Add last element x.push(9)
x.append(9)
x << 9		 x.push(9)
y.concat(5)		 x.append(9); x.extend([9]); x.insert(len(x), 9)
Add first element x.unshift(2) x.unshift(2) x.insert(0,2)
Sort x.sort x.sort() x.sort()
Reverse x.reverse x.reverse() x.reverse()
Count x.count(6) var count = {};
y.forEach(val => count[val] = (count[val] || 0) + 1);		 x.count(6)
Length x.length; x.size; x.count y.length len(y)
Maximum x.max Math.max(...x) max(x)
Minimum x.min Math.min(...x) min(x)
index x.index(3) x.indexOf(3) x.index(3)
insert x.insert(2, 'Feb') x.splice(1, 0, 'Feb') x.insert(2, 'Feb')
Make a copy y = x.dup let y = [...x] y = x[:]
Select, filter x.select{|el| el > 4 } x.filter((el)=> el > 4) filter(lambda el: el > 4, x)
Reduce x.reduce(:+) lx.reduce((result,el)=> result + el,0) reduce(lambda result,y: result + y, x)
Map x.map{|el| el*2} lx.map((el)=> el*2) map(lambda el: el*2,x)
Each z = []
x.each{|el| z << el*2}
p z 		let z = []
lx.forEach((el) => z.push(el * 2))
console.log(z)		 for e in y:
z.append(e * 2)
print z
Reverse loop z = []
x.reverse_each{|el| z << el*2}
p z 		let z = []
x.slice().reverse().forEach((el) => z.push(el * 2))
console.log(z)		 for e in range(len(x) - 1, -1,-1):
z.append(e * 2)
print z
Clear , Reset x.clear x = [] del x[:]

Compound arrays

where, x is [1,2,3] & y is [2,4,5,6]

Description Ruby Javascript Python
Intersection x & y #=> [2] x.filter(e => y.includes(e)) list(set(x) & set(y))
Union x | y
x.union(y)		 var z = [...x,...y]
[...new Set( z )]
'or'Array.from(new Set(z)) 		list(set(x) | set(y))
Join x + y [...x,...y] x + y
Difference x - y x.filter(e => !y.includes(e)); list(set(x) - set(y))

Strings Functions

where, s = 'Cheat sheet '

Description Ruby Javascript Python
UpperCase s.upcase s.toUpperCase() s.upper()
LowerCase s.downcase s.toLowerCase() s.upper()
SwapCase s.swapcase NA s.swapcase()
Trim s.strip! s.trim() s.strip()
StartsWith s.start_with?('cheat') s.startsWith('Cheat') s.startswith('Cheat')
Repeat 'Hi ' * 3 'Hi '.repeat(3) 'Hi ' * 3
Split 'asdf'.split('') 'asdf'.split('') list('asdf')
'a#s#d'.split('#')
Join ['a','s','d','f'].join() ["a", "s", "d", "f"].join('') ''.join(['a','s','d'])
Replace s.replace('Hey')
Find
Count

Numerical Functions

where, el = -22.45

Description Ruby Javascript Python
Ceil el.ceil Math.ceil(el) import math
math.ceil(el)
Floor el.floor Math.floor(el) math.floor(el)
Round el.round(1) Math.round(el) round(el)
Absolute el.abs Math.abs(el) abs(el)
Random rand(10) Math.ceil(Math.random(10) * 11) import random
random.randrange(1,10)
Zero el.zero?
Negative el.negative?

Logical Conditions

Description Ruby Javascript Python
If if <condition1>
elsif <condition2>
else
end		 if <condition1>:
elif <condition2>:
else:		 if (<condition1>) {
} else if (<condition2>) {
} else {
}
case case a
when <condition1>
else
end		 switch(expression) {
case x:
break;
case y:
break;
default:
}		 NA
Ternary Operator true == false ? 1 : 2 true == false ? 1 : 2 1 if (True == False) else 2

Class and Methods or Functions

Description Ruby Javascript Python
Instance Methods def name(input)
p input
end 		name = function(input) {return `${input}`;}
name = (input) => "input"		 def name(input):
print("This is " + input)
Static Methods def self.age(input)
p input
end 		static age(input) {return `${input}`;} @classmethod
def age(input):
print("This is " + input)
Class class Person
attr_accessor :name
def initialize(name)
@name = name
end
end		 class Person {
constructor(name) {
this.name = name;
}
} 		class Person:
def __init__(self, name):
self.name = name
create instance Object p = Person.new('Bezos') let p = new Person("Bezos")
let p1 = Object.create(Person)		 p = Person("Bezos")
Single Inheritance class Employee < Person
def initialize(name)
super name
@name = name
end
end		 class Employee extends Person {
constructor(name) {
super(name)
this.name = name;
}
} 		class Employee(Person):
def __init__(self, name):
self.name = name
Multiple Inheritance module Student
def walk
end
end
class Person
include Human
end 		class Student extends Person class Student(Person):
default values def name(input='bezos')
end		 function(input='bezos') def name(input='bezos')

Regular expression (Regex)

where, lx = "titan titan titan"

Description Ruby Javascript Python
First occurrence lx.match(/t[a-z]*n/)[0] (/t[a-z]*n/).test(lx) //=> true import re
re.search("t[a-z]*n", lx).group()
All occurrences lx.scan(/t[a-z]*n/) lx.match(/t[a-z]*n/gi) re.findall("t[a-z]*n",lx)

Type Conversion

Description Ruby Javascript Python
string to Integer
where, str2int = '99'		 str2int.to_i int(str2int) parseInt(str2int)
Number(str2int)
Integer to string
where, int2str = 66		 int2str.to_s str(int2str) int2str.toString()

Heredocs

Description Ruby Javascript Python
Multiline string content = <<~HEREDOC
I welcome your contributions.
please suggest
a topic
or report an issue
HEREDOC
p content		 content = """ I welcome your contributions.
please suggest
a topic
or report an issue
"""
print(content)

About

An analogy between the Ruby, Javascript and Python languages

Resources

Readme

License

MIT license

Contributing

Contributing

Security policy

Security policy
Activity

Stars

2 stars

Watchers

1 watching

Forks

0 forks
Report repository

Releases

1 tags

Packages

No packages published