theorem.js/src/includes/functions/math/algebra/f.js

A Math library for computation in JavaScript

f(v, func) {
	if (typeof v == 'function') {
		return {
			type: "function",
			core: v
		}
	}
	return {
		type: "function",
		v: v,
		f: func,
		core: x => {
			let regex = new RegExp(v)
			let newStr = func.replace(regex, `(${x})`)
			return eval(newStr).toFixed(14)
		}
	}
}