Introduction to Aproba

Aproba is a lightweight and highly efficient argument validation library for Node.js, making it simpler to validate the arguments passed to your functions. If you’re tired of manually checking each argument’s type, Aproba will be a lifesaver!

Key APIs and Their Use Cases

1. Basic Usage

The primary function of Aproba is aproba, which checks if the arguments of a function match a specific pattern.

const aproba = require('aproba');

function exampleFunc(name, age, callback) {
 aproba('SNF', arguments);
 console.log(\`Name: \${name}, Age: \${age}\`);
 callback();
}

exampleFunc('John', 30, () => console.log('Done!'));

2. Optional Arguments

Using aproba, you can denote optional arguments by enclosing them in parentheses.

function exampleFunc(name, age, callback) {
 aproba('S(N)F', arguments);
 console.log(\`Name: \${name}, Age: \${age}\`);
 callback();
}

exampleFunc('John', null, () => console.log('Done!'));

3. Variadic Arguments

Aproba supports variadic arguments indicated by a plus sign.

function exampleFunc(...args) {
 aproba('S+', args);
 args.forEach(arg => console.log(arg));
}

exampleFunc('Hello', 'World', '!');

4. Type Combinations

Combine multiple types using the pipe character.

function exampleFunc(input) {
 aproba('S|N|A', [input]);
 console.log(input);
}

exampleFunc('String');
exampleFunc(123);
exampleFunc([1, 2, 3]);

5. Complex Patterns

For functions with more complex argument validation requirements, Aproba allows the use of regular expressions.

function exampleFunc(arg1, arg2) {
 aproba('A|0|1', arguments);
 console.log(\`Arguments: \${arg1}, \${arg2}\`);
}

exampleFunc([1, 2]);
exampleFunc(0, 'Any Value');
exampleFunc(1, 42);

An Application Using Aproba

Here is a simple Express.js application utilizing Aproba to validate function arguments.

const express = require('express');
const aproba = require('aproba');
const app = express();

app.get('/user/:id', (req, res) => {
 aproba('O|S', [req.params.id]);
 res.send(\`User ID: \${req.params.id}\`);
});

app.listen(3000, () => {
 console.log('Server is running on port 3000');
});

Conclusion

Aproba is a powerful tool for argument validation in Node.js, ensuring that your functions are robust and error-free. By using Aproba, you save time, improve code readability, and reduce the risk of bugs.

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