decimal to hex.js

function toHex(num) {
	const base = 16;
	const hexVals = '0123456789abcdef';
	let hex = [];
	let sign = 1;
	
	if(num === 0) return '0';
	if(num < 0) {
		sign = -1;
		num = -num;
	}
	
	while(num) {
		let remainder = num % base;
		num = (num - remainder) / base;
		
		hex.push(hexVals[remainder]);
	}
	
	if(sign === 1) {
		return hex.reverse().join('');
	} else {
		let j = hex.length;
		let carryDig = 1;
		
		for(let i = 0; i < j; i++) {
			if(hex[i] !== '0' || !carryDig) {
				hex[i] = hexVals[base - 1 + carryDig - hexVals.indexOf(hex[i])];
				carryDig = 0
			}
		}
		// Check fo carry digit
		if(carryDig) hex.push('1');
	}
	return 'f'.repeat(8 - hex.length) + hex.reverse().join('');
}

/**
 * @Matt 
 */
function decimalToHex(num) {
	// Exit immediately if no calculations or variables are needed
	if(num === 0) return '0';
	
	const base = 16;
	const hexVals = '0123456789abcdef';
	let hexCharArray = [];
	const isNumPositive = num < 0 ? false : true;
	
	if(!!isNumPositive) num = Math.abs(num);

	while(num) {
		const remainder = num % base;
		num = (num - remainder) / base;
		
		hexCharArray.push(hexVals[remainder]);
	}
	
	if(isNumPositive) return hexCharArray.reverse().join('');
	 

	let carryDig = 1;

	hexCharArray = hexCharArray.map((hexChar, idx) => {
		let returnChar = '';
		if(hexChar !== '0' || !carryDig) {
			returnChar = hexVals[base - 1 + carryDig - hexVals.indexOf(hexChar)];
			carryDig = 0;
			return returnChar;
		}
	});
	// Check for carry digit
	if(carryDig) hexCharArray.push('1');
	
	return 'f'.repeat(base/2 - hexCharArray.length) + hexCharArray.reverse().join('');
}