JavaScript 就像 Python

// in codeguppy.com environment println('hello, world');  // outside codeguppy.com console.log('hello, world'); 

print('hello, world') 

let myvariable = 100;  const myconstant = 3.14159; 

myvariable = 100  myconstant = 3.14159 

let a = 100; let b = 200;  println(`sum of ${a} and ${b} is ${a + b}`); 

a = 100 b = 200  print(f'sum of {a} and {b} is {a + b}') 

let age = 18;  if (age < 13)  {     println("child"); }  else if (age < 20)  {     println("teenager"); }  else  {     println("adult"); } 

age = 18  if age < 13:     print("child") elif age < 20:     print("teenager") else:     print("adult") 

let age = 20; let message = age >= 18 ? "can vote" : "cannot vote"; println(message);  // output: can vote 

age = 20 message = "can vote" if age >= 18 else "cannot vote" print(message)  # output: can vote 

// creating an array let myarray = [1, 2, 3, 4, 5];  // accessing elements println(myarray[0]);  // access the first element: 1 println(myarray[3]);  // access the fourth element: 4  // modifying an element myarray[2] = 30;  // change the third element from 3 to 30  // adding a new element myarray.push(6);  // add a new element to the end 

# creating a list to represent an array my_array = [1, 2, 3, 4, 5]  # accessing elements print(my_array[0])  # access the first element: 1 print(my_array[3])  # access the fourth element: 4  # modifying an element my_array[2] = 30  # change the third element from 3 to 30  # adding a new element my_array.append(6)  # add a new element to the end 

let fruits = ["apple", "banana", "cherry", "date"];  for(let fruit of fruits)     println(fruit); 

fruits = ["apple", "banana", "cherry", "date"]  for fruit in fruits:     print(fruit) 

// creating a dictionary fruit_prices = {     apple: 0.65,     banana: 0.35,     cherry: 0.85 };  // accessing a value by key println(fruit_prices["apple"]);  // output: 0.65 

# creating a dictionary fruit_prices = {     "apple": 0.65,     "banana": 0.35,     "cherry": 0.85 }  # accessing a value by key print(fruit_prices["apple"])  # output: 0.65 

function addnumbers(a, b)  {     return a + b; }  let result = addnumbers(100, 200); println("the sum is: ", result); 

def add_numbers(a, b):     return a + b  result = add_numbers(100, 200) print("the sum is: ", result) 

function getcircleproperties(radius)  {     const area = math.pi * radius ** 2;     const circumference = 2 * math.pi * radius;      return [area, circumference];  // return as an array }  // using the function const [area, circumference] = getcircleproperties(5);  println(`the area of the circle is: ${area}`); println(`the circumference of the circle is: ${circumference}`); 

import math  def getcircleproperties(radius):     """calculate and return the area and circumference of a circle."""     area = math.pi * radius**2     circumference = 2 * math.pi * radius     return (area, circumference)  # using the function radius = 5 area, circumference = getcircleproperties(radius)  print(f"the area of the circle is: {area}") print(f"the circumference of the circle is: {circumference}") 

function sumnumbers(...args)  {     let sum = 0;     for(let i of args)         sum += i;     return sum; }  println(sumnumbers(1, 2, 3)); println(sumnumbers(100, 200)); 

def sum_numbers(*args):     sum = 0     for i in args:         sum += i     return sum  print(sum_numbers(1, 2, 3)) print(sum_numbers(100, 200)) 

const numbers = [1, 2, 3, 4, 5];  // use map to apply a function to all elements of the array const squarednumbers = numbers.map(x => x ** 2);  println(squarednumbers);  // output: [1, 4, 9, 16, 25] 

numbers = [1, 2, 3, 4, 5]  # use map to apply a function to all elements of the list squared_numbers = map(lambda x: x**2, numbers)  # convert map object to a list to print the results squared_numbers_list = list(squared_numbers)  print(squared_numbers_list)  # output: [1, 4, 9, 16, 25] 

class book  {     constructor(title, author, pages)      {         this.title = title;         this.author = author;         this.pages = pages;     }      describebook()      {         println(`book title: ${this.title}`);         println(`author: ${this.author}`);         println(`number of pages: ${this.pages}`);     } } 

class book:     def __init__(self, title, author, pages):         self.title = title         self.author = author         self.pages = pages      def describe_book(self):         print(f"book title: {self.title}")         print(f"author: {self.author}")         print(f"number of pages: {self.pages}") 

// creating an instance of the book class // this is actually a real book (see curriculum section for more info) const mybook = new book("illustrated javascript", "adrian", 684); mybook.describebook(); 

# Creating an instance of the Book class # This is actually a real book (see Curriculum section for more info) my_book = Book("Illustrated JavaScript", "Adrian", 684) my_book.describe_book()