[Algorithm] 13 week(4.04 ~ 4.10) 3/3

2194. Cells in a Range on an Excel Sheet

var cellsInRange = function(s) {
    const [startStr, startNum, colon, endStr, endNum] = s.split("");
    startString = startStr.charCodeAt();
    endString = endStr.charCodeAt();

    const result = [];
    for(let charNum = startString; charNum <= endString; charNum++) {
        for(let num = startNum; num <= endNum; num++){
            result.push(`${String.fromCharCode(charNum)}${num}`)
        }
    }
        
    
    return result;
};