Converts a string to a brainfuck program that prints the said string

str_to_brainfuck.js

const COMMAND = {
	next: '>',
	prev: '<',
	
	increment: '+',
	decrement: '-',
	
	print: '.',
	accept: ',',
	
	loop: '[',
	endLoop: ']'
};
const TEN_INCREMENT = '+++++ +++++';
const STANDARD_LOOP = COMMAND.loop + COMMAND.next + TEN_INCREMENT + COMMAND.prev + 
	COMMAND.decrement + COMMAND.endLoop + COMMAND.next;

class Converter {
	convert (str) {
		let prevCharCode = 0;
		
		return str.split("").reduce((acc, c) => {
			let result = acc + this._charToBrainfuck(c.charCodeAt(0), prevCharCode);
			
			prevCharCode = c.charCodeAt(0);
			
			return result;
		}, "");
	}
	
	_charToBrainfuck (charCode, prevCharCode) {
		let diff = Math.abs(charCode - prevCharCode);
		let up = prevCharCode < charCode;
		
		let tens = Math.floor(diff / 10);
		let ones = diff - tens * 10;
			
		let result = (tens > 0 && prevCharCode !== 0) ? COMMAND.prev : "";
		
		for (let i = 0; i < tens; i++)
			result += up ? COMMAND.increment : COMMAND.decrement;
		
		if (tens > 0)
			result += STANDARD_LOOP;
			
		for (let i = 0; i < ones; i++)
			result += up ? COMMAND.increment : COMMAND.decrement;
			
		return result + COMMAND.print;
	}
};

console.log(new Converter().convert("Convert me"));