[Negative State Programming] #JavaScript

index.js

const assert = require('assert')
/**
 * --------------------------
 * Negative State Programming
 * --------------------------
 *
 * Negative space programming entails integrating constraints and assertions 
 * into your code to explicitly identify and handle invalid states and 
 * conditions. This approach ensures that errors are detected and addressed
 * promptly, preventing unintended behaviors from spreading throughout the
 * system. By adopting this method, you improve the software's reliability
 * while also clearly documenting the developer's intentions, thereby
 * providing both validation and communication benefits.
**/

function add( a, b ) {
  assert(typeof a === 'number', 'a should be a number');
  assert(typeof b === 'number', 'b should be a number');
}