• 切面条

const 切面条 = (n=10)=>{
    return 2 ** n + 1;
}
切面条(0) === 2
切面条(1) === 3
切面条(2) === 5
切面条(10) === 1025

• 大衍数列

const 大衍数列 = (n=100) => {
    let ans = []
    for(let i=1;i<=n;i++){
        if(i%2 == 0){
            ans.push((i ** 2 ) / 2)
        }else{
            ans.push((i ** 2 - 1) / 2)
        }
    }
    return ans;
}

大衍数列(100)

• 门牌制作

const 门牌制作 = (n=2020) => {
    let ans = 0;
    for(let i=1; i <= n; i++){
        let x = i;
        while(x){
            if(x%10 == 2){
                ans ++;
            }
            x = ~~(x/10)
        }
    }
    return ans;
}

• 方阵转置

const 方阵转置 = (arr)=>{
    let {length:len} = arr;
    for(let n = 0; n < len; n++){
        for(let m = 0; m < len; m++){
            (m > n) && ([arr[m][n],arr[n][m]] = [arr[n][m],arr[m][n]]) 
        }
    }
    return arr;
}
方阵转置([
    [34,76,-54,7],
    [-4, 5, 23,9],
    [ 0, 0, 0, 0],
    [ 0, 0, 0, 0]
]);

• 微生物增值

const 微生物增值 = (x=10,y=90)=>{
    for(let i = 1; i <= 120; i++){
        if(i % 2 == 1){
            y -= x;
        }
        if(i % 4 == 0){
            y *= 2
        }
        if(i % 6 == 0){
            x *= 2 
        }
    }
    return y < 0 ? 0 : y;
}
微生物增值()

• 成绩统计

const 成绩统计 = (students)=>{
    let [max,min] = [0,301]
    let mins,maxs;
    for(let student of students){
        let sum = student.yy + student.sx + student.cpp;
        if(min > sum){
            min = sum;
            mins = student.xm; 
        }
        if(max < sum){
            max = sum;
            maxs = student.xm;
        }
    }
    return [maxs,mins]
}

成绩统计([{xm:'yx1',xh:'1',yy:45,sx:67,cpp:87},
{xm:'yx2',xh:'2',yy:88,sx:90,cpp:99}])

• 星系炸弹

const 星系炸弹 = (year = 2014,month = 11,day = 9,days = 1000) => {
    const monthDays = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
    for(let i = 0; i< days; i++){
        day ++;
        if(day > monthDays[month - 1]){
            day = 1;
            month ++;
            if(month > 12){
                month = 1;
                year ++;
                if(!(year % 400)||(!(year%4) && (year%100)) ){
                    monthDays[1] = 29
                }else{
                    monthDays[1] = 28
                }
            }
        }
    }
    return `${year}-${month}-${day}`
}
星系炸弹();

• 特别数的和

const 特别数的和 = (n = 40)=>{
    const check = (n)=>{
        while(n){
            let tmpn = n%10;
            if(tmpn == 2||tmpn == 0||tmpn == 1||tmpn == 9)
            return true;
            n=~~(n/10)
        }
        return false;
    }
    let ans = 0;
    for(let i=1;i<=n;i++){
        if(check(i)){
            ans += i;
        }
    }
    return ans;
}
特别数的和();