Comparing JavaScript and Ruby

javascript_compare.js

// Functions
function hello() {
  console.log("Hello World")
}

// Calling a function
hello // function
hello() // "Hello World"

// Returning from functions
var helloTwo = function() {
  return "Hello World Again"
}

console.log(helloTwo())

// Functions with different args passed in
var hello_three = function(please, fill, out) {
  console.log("We ran!")
}

hello_three("yass") // "We ran!"
hello_three("yass","queen","hello","fourth") // "We ran"
// Destructive Functions

var a = [1, 2, 3]
a.reverse()
a // [3, 2, 1]

// Each
var a = [1, 2, 3]
var b = []

a.forEach(function(number) {
  b.push(number + 1)
})

// For
for (var i = 0; i <= 10; i++) {
  console.log("Hello, string interpolation " + i)
}

// ES6 Way
for (var j = 0; j <= 10; j++) {
  console.log(`Hello, string interpolation ${j}`)
}

// Objects
var h = {}
h.first = 1
h.second = 2
h.first // 1
h['second'] // 2
var place = 'second'
h[place] // 2
h.place // undefined
h['third'] = function () {
  console.log(3)
  return 3
}
h.fourth // undefined
h.third // function
h['third'] // function
h.third() // 3

// Classes
function Dog(firstName, age, breed, secret) {
  var secret = secret

  this.firstName = firstName
  this.age = age
  this.breed = breed
}

Dog.prototype.woof = function() {
  return this.firstName + "woofs."
}

var karl = new Dog("Karl",0,"Finnish Spitz", "Shhh")
var paul = new Dog("Paul",5,"Golden Retriever")
karl.woof()
karl.secret // undefined
karl.secret // Error
karl.firstName // "Karl"
karl.firstName = "Carl"
karl.firstName // "Carl"



// Conditionals
var arr = []
if (arr) {
  console.log("We did it!")
}

// Equality
undefined == null // true
undefined === false // false
[] == false // true
[] === false // false
0 == false // true
0 === false // false
0 == "" // true
"" == false // true
"" === false // false
null == false // false
[1, 2] == [1, 2] // false
[1, 2] === [1, 2] // false

ruby_compare.rb

# Functions
def hello
  puts "Hello World"
end

# Calling a function
hello # "Hello World"

# Returning from functions
def hello_two
  "Hello World Again" # Will get returned
end

p hello_two

# Functions with different args passed in
def hello_three(please, fill, in)
  p "It ran!"
end

hello_three("yass") # Error

# Destructive Functions

a = [1, 2, 3]
a.reverse!
a # [3, 2, 1]
a.reverse # [1, 2, 3]
a # [3, 2, 1]

# Each
a = [1, 2, 3]
b = []

a.each do |number|
  b << number + 1
end

b # [2, 3, 4]

# For
for i in 0..10
  puts "Hello, string interpolation #{i}"
end

(0..10).each { |n|
  puts "Hello, string interpolation #{n}"
}

# Hashes
h = {}
h['first'] = 1
h['second'] = 2
h['third'] # nil
h.third # Error

# Classes

class Dog
  attr_accessor :name, :age, :breed

  def initialize(name, age, breed)
    @name = name
    @age = age
    @breed = breed
  end

  def woof
    "#{@name} woofs."
  end
end

karl = Dog.new("Karl",0,"Finnish Spitz")
karl.woof # Karl woofs.

# Equality
[] == false # false
nil == false # false
[1, 2] == [1, 2] # true