codewars练习（javascript）-2021/3/2

codewars-js练习

2021/3/2

github 地址

my github地址，上面有做的习题记录，不断更新…

【1】<7kyu>【Shifter words】

You probably know that some characters written on a piece of paper, after turning this sheet 180 degrees, can be read, although somitimes in a different way. So, uppercase letters “H”, “I”, “N”, “O”, “S”, “X”, “Z” after rotation are not changed, the letter “M” becomes a “W”, and Vice versa, the letter “W” becomes a “M”.

example：

shifter("SOS IN THE HOME") === 2 // shifter words are "SOS" and "IN"
shifter("WHO IS SHIFTER AND WHO IS NO") === 3 // shifter words are "WHO", "IS", "NO"
shifter("TASK") === 0 // no shifter words
shifter("") === 0 // no shifter words in empty string

solution

<script type="text/javascript">
        function shifter(s){
            // console.log(s);
            if(s == '')return 0
            // 去重数组
            let arr = [...new Set(s.split(' '))];
            // console.log(arr);
            let num = 0;

            for(let i=0;i<arr.length;i++){
                if((/[HINOSXZMW]/g).test(arr[i])){
                    var temp = arr[i].match(/[HINOSXZMW]/g).join('');
                    if(temp == arr[i])num ++; 
                }
            }
            return num;
        }

        // 验证
        console.log(shifter("ON"));// 1
        console.log(shifter("WHO IS SHIFTER AND WHO IS NO"));//3
        console.log(shifter(""));//0 
        console.log(shifter("I III A III"));//2
	</script>

【2】<7kyu>【Separate basic types】

Given: a sequence of different type of values (number, string, boolean). You should return an object with a separate properties for each of types presented in input. Each property should contain an array of corresponding values.

• keep order of values like in input array
• if type is not presented in input, no corresponding property are expected

即分离number、string和boolean

example：

['a', 1, 2, false, 'b']//{number: [1, 2],string: ['a', 'b'],boolean: [false]}
['a', 1, 2 ]//{number: [1, 2],  string: ['a']}

solution

<script type="text/javascript">
        function separateTypes(input) {
            // console.log(input)
            let map = {};
            let str = [];
            let num = [];
            let bool = [];
            for(let i=0;i<input.length;i++){
                if(typeof input[i] == 'string')str.push(input[i])
                else if(typeof input[i] == 'number')num.push(input[i])
                else if(typeof input[i] == 'boolean')bool.push(input[i])
            }
            if(str.length!=0)map['string'] = str;
            if(num.length!=0)map['number'] = num;
            if(bool.length!=0)map['boolean'] = bool
            
            // console.log(map)
            return map
        }

        // 验证
        console.log(separateTypes(['a', 1, 2, false, 'b']));//{number: [1, 2],string: ['a', 'b'],boolean: [false]}
        console.log(separateTypes(['a', 1, 2 ]));//{number: [1, 2],  string: ['a']}
	</script>

以上为自己思路供大家参考，可能有更优的思路。