📂 Issue Category

• Feature Request ✨

📝 Issue Summary

Add Euler's number (E) as a new mathematical constant in p5.js

Most appropriate sub-area of p5.js?

• Accessibility
• Color
• Core/Environment/Rendering
• Data
• DOM
• Events
• Image
• IO
• Math
• Typography
• Utilities
• WebGL
• Build process
• Unit testing
• Internationalization
• Friendly errors
• Other (specify if possible)

Feature request details

🔹 Description

Euler's number (E, approximately 2.71828) is a fundamental mathematical constant representing the base of natural logarithms. It plays a crucial role in:

• Exponential growth and decay models
• Compound interest calculations
• Probability distributions (e.g., Poisson, exponential)
• Calculus and differential equations
• Natural phenomena simulations

p5.js currently provides several mathematical constants (PI, TWO_PI, HALF_PI, TAU), but notably lacks E. Adding this constant would:

• Complete the set of essential mathematical constants
• Eliminate the need for users to define E manually or use Math.E
• Maintain consistency with the library's existing constant naming conventions
• Enhance p5.js's utility for mathematical visualizations and educational projects

🔹 Proposed Implementation

1. Add constant definition in src/core/constants.js:

/**
 * The mathematical constant Euler's number (e), the base of natural logarithms.
 * It is approximately equal to 2.71828.
 *
 * @property {Number} E
 * @final
 * @example
 * <div><code>
 * // Calculate exponential growth
 * let growth = E ** 2;
 * text('e² = ' + growth.toFixed(4), 10, 50);
 * </code></div>
 */
export const E = Math.E;