[프로그래머스] 위클리챌린지 2주차

grade_01.js

function solution(sample) {
    let scores = [];
    let grades = "";
    const S_LENGTH = sample.length;
    
        function calc(index, score){
    
        const MAX = Math.max(...score);
        const MIN = Math.min(...score);
        const SELF = score[index];
        const cnt = score.filter(el => el == SELF).length;
        let total = score.reduce((acc, cv) => acc + cv);
        let average ;
        
        if((SELF == MAX || SELF == MIN) && (cnt == 1)){
            total -= SELF;
            average = total / (S_LENGTH-1);
        } else {
            average = total / S_LENGTH;
        }

            
        switch(true){
            case (average >= 90):
                return "A";
                
            case (average >= 80):
                return "B";
                
            case (average >= 70):
                return "C";
                
            case (average >= 50):
                return "D";
                
            case (average < 50):
                return "F";
        }
    }
    
    for(let i=0; i < S_LENGTH; i++){
        const temp = [];
        for(let j=0; j < S_LENGTH; j++){
            temp.push(sample[j][i]);
        }
        scores.push(temp);
    }
    

    for(let i=0; i < S_LENGTH; i++){
        grades += calc(i, scores[i]);
    }
    
    return grades;
}