This article presents a comparison between the syntax and fundamental programming constructs of JavaScript and Python. It aims to highlight similarities in how basic programming concepts are implemented across these two popular programming languages.
While both languages share many commonalities, making it easier for developers to switch between them or understand the other's code, there are also distinct syntactical and operational differences that one should be aware of.
It's important to approach this comparison with a light-hearted perspective and not to overemphasize the likeness or differences between JavaScript and Python. The intention is not to declare one language superior to the other but to provide a resource that can help coders who are familiar with Python to understand and transition to JavaScript more easily.
JavaScript
// In codeguppy.com environment
println('Hello, World');
// Outside codeguppy.com
console.log('Hello, World');
Python
print('Hello, World')
JavaScript
let myVariable = 100; const MYCONSTANT = 3.14159;
Python
myVariable = 100 MYCONSTANT = 3.14159
JavaScript
let a = 100;
let b = 200;
println(`Sum of ${a} and ${b} is ${a + b}`);
Python
a = 100
b = 200
print(f'Sum of {a} and {b} is {a + b}')
JavaScript
let age = 18;
if (age < 13)
{
println("Child");
}
else if (age < 20)
{
println("Teenager");
}
else
{
println("Adult");
}
Python
age = 18
if age < 13:
print("Child")
elif age < 20:
print("Teenager")
else:
print("Adult")
JavaScript
let age = 20; let message = age >= 18 ? "Can vote" : "Cannot vote"; println(message); // Output: Can vote
Python
age = 20 message = "Can vote" if age >= 18 else "Cannot vote" print(message) # Output: Can vote
JavaScript
// 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
Python
# 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
JavaScript
let fruits = ["apple", "banana", "cherry", "date"];
for(let fruit of fruits)
println(fruit);
Python
fruits = ["apple", "banana", "cherry", "date"]
for fruit in fruits:
print(fruit)
JavaScript
// 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
Python
# 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
JavaScript
function addNumbers(a, b)
{
return a + b;
}
let result = addNumbers(100, 200);
println("The sum is: ", result);
Python
def add_numbers(a, b):
return a + b
result = add_numbers(100, 200)
print("The sum is: ", result)
JavaScript
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}`);
Python
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}")
JavaScript
function sumNumbers(...args)
{
let sum = 0;
for(let i of args)
sum += i;
return sum;
}
println(sumNumbers(1, 2, 3));
println(sumNumbers(100, 200));
Python
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))
JavaScript
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]
Python
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]
JavaScript
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}`);
}
}
Python
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}")
JavaScript
// In codeguppy.com environment
println('Hello, World');
// Outside codeguppy.com
console.log('Hello, World');
Python
print('Hello, World')
We encourage you to get involved in refining this comparison. Your contributions, whether they are corrections, enhancements, or new additions, are highly valued. By collaborating, we can create a more accurate and comprehensive guide that benefits all developers interested in learning about JavaScript and Python.
This article was republished from the blog of the free coding platform https://codeguppy.com platform.
The article was influenced by similar comparisons between other programming languages:
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