Division using only addition and subtraction

division.js

// Remainder of the division (Остаток от деления)
const b = (num1, num2) => {
	const convertValues = (num1, num2) => {
		let isNegative = false;

		if (num1 < 0 && num2 < 0) {
			num1 = -num1;
			num2 = -num2;
		} else if (num1 < 0) {
			num1 = -num1;
			isNegative = true;
		} else if (num2 < 0) {
			num2 = -num2;
			isNegative = true;
		}

		return [num1, num2, isNegative];
	}

	let isNegative;

	[num1, num2, isNegative] = convertValues(num1, num2);
	let helpSum = num2;

	while (num1 >= num2) {
		while (num1 - helpSum >= 0) {
			num1 = num1 - helpSum,
			helpSum += helpSum;
		}
		helpSum = num2;
	}


	return isNegative ? -num1 : num1;
}

// Integer division (Целое от деления)
const c = (num1, num2) => {
	const convertValues = (num1, num2) => {
		let isNegative = false;

		if (num1 < 0 && num2 < 0) {
			num1 = num1 - num1 - num1;
			num2 = num2 - num2 - num2;
		} else if (num1 < 0) {
			num1 = num1 - num1 - num1;
			isNegative = true;
		} else if (num2 < 0) {
			num2 = num2 - num2 - num2;
			isNegative = true;
		}

		return [num1, num2, isNegative];
	}

	let isNegative;

	[num1, num2, isNegative] = convertValues(num1, num2);
	let helpSum = num2;
	let result = 0;
	let x = 1;

	while (num1 >= num2) {
		while (num1 - helpSum >= 0) {
			num1 = num1 - helpSum,
			helpSum += helpSum;
			result += x;
			x += x;
		}
		helpSum = num2;
		x = 1;
	}

	return isNegative ? -result : result;
}