SyntaxPilot

Compare programming syntax across languages

Quickly compare syntax between languages

When you switch between programming languages or return to coding after a break, remembering exact syntax is challenging. SyntaxPilot shows you the most common patterns side-by-side so you can focus on solving problems instead of searching documentation.

Select two languages below to see how they handle loops, conditionals, functions, and other everyday coding tasks. Each example is ready to copy and modify for your own projects.

For Loop

for (let i = 0; i < 5; i++) {
  console.log(i);
}
for i in range(5):
    print(i)

While Loop

let count = 0;
while (count < 5) {
  console.log(count);
  count++;
}
count = 0
while count < 5:
    print(count)
    count += 1

Conditional (If/Else)

let age = 20;
if (age >= 18) {
  console.log("Adult");
} else {
  console.log("Minor");
}
age = 20
if age >= 18:
    print("Adult")
else:
    print("Minor")

Function Definition

function greet(name) {
  return "Hello, " + name;
}

greet("World");
def greet(name):
    return f"Hello, {name}"

greet("World")

Class Definition

class Person {
  constructor(name) {
    this.name = name;
  }

  speak() {
    console.log("My name is " + this.name);
  }
}

let p = new Person("Alice");
p.speak();
class Person:
    def __init__(self, name):
        self.name = name

    def speak(self):
        print(f"My name is {self.name}")

p = Person("Alice")
p.speak()

Array/List Operations

let nums = [1, 2, 3];
nums.push(4);
console.log(nums.map(x => x * 2));
nums = [1, 2, 3]
nums.append(4)
print([x * 2 for x in nums])

Using SyntaxPilot effectively

Copy examples directly: Click on any code block to copy it to your clipboard. This works faster than manually selecting text.

Edit and experiment: The code examples are designed to be modified. Try changing values, adding print statements, or adapting the structure for your specific use case.

Language-specific quirks: While this covers common patterns, each language has unique features. For example, JavaScript has arrow functions and promises, while Python has list comprehensions and decorators.

Version considerations: Syntax has evolved over time. Python 2 vs Python 3, JavaScript ES5 vs ES6+, and other version differences matter. Always verify with your project's specific version.

Common mistakes to avoid

Common error messages explained

SyntaxError: Unexpected token
Usually means a typo or missing bracket in JavaScript. Check that every opening brace has a matching closing brace.
IndentationError: unexpected indent
Python error indicating inconsistent indentation. Make sure you're using only spaces or only tabs throughout your file.
ReferenceError: variable is not defined
JavaScript error when trying to use a variable that hasn't been declared or is out of scope.
NameError: name 'variable' is not defined
Python error when a variable name is misspelled or used before being defined.

Tips for language switching

When moving between languages, keep these patterns in mind: