Introduction to Aproba

Aproba is a lightweight validation utility to ensure your API calls comply with the expected argument specifications. It allows developers to succinctly specify the types and number of arguments a function should accept. Here’s an in-depth look into Aproba with various API examples to help you get started.

APIs and Examples

Basic Type Checking

Check if the first argument is a number and the second is a string:

  const aproba = require('aproba');
  aproba('ns', [42, 'hello']);

Array Type Checking

Validate that the first argument is an array and the second is an object:

  aproba('AO', [[1, 2, 3], {key: 'value'}]);

Optional Arguments

Allowing an optional second argument (object):

  aproba('A?O', [undefined, {key: 'value'}]);

Multiple Type Options

First argument can be a number or string, second argument must be a boolean:

  aproba('NSB', ['string', true]);

Custom Error Handling

Customize error message when validation fails:

  try {
    aproba('NA', [42, 'should be array']);
  } catch (error) {
    console.error('Argument validation failed: ', error.message);
  }

Advanced Patterns

Validate more complex patterns with nested types:

  aproba('{key: N}', [{key: 42}]);

Application Example

Let’s build a simple application to demonstrate how Aproba can be used extensively:

  const aproba = require('aproba');

  function processData(userId, data) {
    // Validate arguments
    aproba('NS', [userId, data]);

    // Business logic
    console.log(`Processing data for user: ${userId}`);
    console.log(`Data received: ${data}`);
  }

  function updateUserDetails(userId, userDetails) {
    // Validate arguments
    aproba('NO?', [userId, userDetails]);

    // Business logic
    console.log(`Updating details for user: ${userId}`);
    userDetails && console.log(`New details: ${JSON.stringify(userDetails)}`);
  }

  // Usage
  processData(123, 'sample data');
  updateUserDetails(456, {name: 'John Doe'});
  updateUserDetails(789); // Optional parameter

In the above application, Aproba ensures the validation of inputs before executing the core logic, making the code more robust and less error-prone.

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