codewars练习（javascript）-2021/2/24

codewars-js练习

2021/2/24

github 地址

my github地址，上面有做的习题记录，不断更新…

【1】<8kyu>【Grasshopper - Grade book】

完成该函数，以便它找到传递给它的三个分数的平均值，并返回与该成绩相关的字母值。

example：

Numerical Score	Letter Grade
90 <= score <= 100	'A'
80 <= score < 90	'B'
70 <= score < 80	'C'
60 <= score < 70	'D'
0 <= score < 60	'F'

solution

<script type="text/javascript">
        function getGrade (s1, s2, s3) {
            console.log(s1,s2,s3)
            var score = (s1 + s2 + s3)/3
            if(score<60 && score >=0)return 'F';
            else if(score<70 && score >=60 )return 'D'
            else if(score<80 && score >=70 )return 'C'
            else if(score<90 && score >=80 )return 'B'
            else return 'A'
        }
    
        // 验证
        console.log(getGrade(95,90,93));// 'A'
        console.log(getGrade(44,55,52));// 'F'
	</script>

【2】<8kyu>【Stringy Strings】

write me a function stringy that takes a size and returns a string of alternating '1s' and '0s'.

example：

the string should start with a 1.

a string with size 6 should return :'101010'.

with size 4 should return : '1010'.

with size 12 should return : '101010101010'.

The size will always be positive and will only use whole numbers.

solution

<script type="text/javascript">
       function stringy(size) {
            var str='';
            for( var i=1; i<=size; i++ )
                str+=i%2;
            return str;
        }
    
        // 验证
        console.log(stringy(1))//1
        console.log(stringy(6));// '101010'
        console.log(stringy(4));// '1010'
	</script>

以上为自己思路供大家参考，可能有更优的思路。