JavaScript 就像 Python

// in codeguppy.com environmentprintln('hello, world');// outside codeguppy.comconsole.log('hello, world');

print('hello, world')

let myvariable = 100;const myconstant = 3.14159;

myvariable = 100myconstant = 3.14159

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

a = 100b = 200print(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 = 18if 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 = 20message = "can vote" if age >= 18 else "cannot vote"print(message)  # output: can vote

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

# creating a list to represent an arraymy_array = [1, 2, 3, 4, 5]# accessing elementsprint(my_array[0])  # access the first element: 1print(my_array[3])  # access the fourth element: 4# modifying an elementmy_array[2] = 30  # change the third element from 3 to 30# adding a new elementmy_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 dictionaryfruit_prices = {    apple: 0.65,    banana: 0.35,    cherry: 0.85};// accessing a value by keyprintln(fruit_prices["apple"]);  // output: 0.65

# creating a dictionaryfruit_prices = {    "apple": 0.65,    "banana": 0.35,    "cherry": 0.85}# accessing a value by keyprint(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 + bresult = 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 functionconst [area, circumference] = getcircleproperties(5);println(`the area of the circle is: ${area}`);println(`the circumference of the circle is: ${circumference}`);

import mathdef 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 functionradius = 5area, 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 sumprint(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 arrayconst 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 listsquared_numbers = map(lambda x: x**2, numbers)# convert map object to a list to print the resultssquared_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()