cetra/lib/plugins/StandardLibrary/Math.js

function inc(val, options = [1]) {
	let [name, amount = 1, ..._rest] = options;
	return {
		varName: name,
		new: val * 1 + amount * 1,
		old: val * 1,
	};
}

function dec(val, options = [1]) {
	let [name, amount = 1, ..._rest] = options;
	return {
		varName: name,
		new: val * 1 - amount * 1,
		old: val * 1,
	};
}

function mult(val, options = [1]) {
	let [name, amount = 1, ..._rest] = options;
	return {
		varName: name,
		new: val * 1 * amount * 1,
		old: val * 1,
	};
}

function div(val, options = [1]) {
	let [name, amount = 1, ..._rest] = options;
	return {
		varName: name,
		new: ((val * 1) / amount) * 1,
		old: val * 1,
	};
}

function pow(val, options = [1]) {
	let [name, amount = 1, ..._rest] = options;
	return {
		varName: name,
		new: Math.pow(val * 1, amount * 1),
		old: val * 1,
	};
}

const BasicArithmetic = new Map([
	['increment', inc],
	['increase', inc],
	['inc', inc],
	['decrement', dec],
	['decrease', dec],
	['dec', dec],
	['multiply', mult],
	['mult', mult],
	['divide', div],
	['div', div],
	['pow', pow],
]);

export default new Map([...BasicArithmetic.entries()]);