Ryan Velazquez rdvelazquez

ppseprus / entropy-in-short.js

Last active August 22, 2024 10:13 — forked from jabney/entropy.js

Javascript implementation of a Shannon entropy calculation in bits per symbol

	// Shannon entropy
	const entropy = str => {
	return [...new Set(str)]
	.map(chr => {
	return str.match(new RegExp(chr, 'g')).length;
	})
	.reduce((sum, frequency) => {
	let p = frequency / str.length;
	return sum + p * Math.log2(1 / p);
	}, 0);