codewars练习（javascript）-2021/1/30

codewars-js练习

2021/1/30

github 地址

my github地址，上面有做的习题记录，不断更新…

【1】<8kyu>【Check the exam】

The first input array is the key to the correct answers to an exam, like [“a”, “a”, “b”, “d”]. The second one contains a student’s submitted answers.

The two arrays are not empty and are the same length. Return the score for this array of answers, giving +4 for each correct answer, -1 for each incorrect answer, and +0 for each blank answer, represented as an empty string (in C the space character is used).

If the score < 0, return 0.

example：

checkExam(["a", "a", "b", "b"], ["a", "c", "b", "d"]) → 6
checkExam(["a", "a", "c", "b"], ["a", "a", "b",  ""]) → 7
checkExam(["a", "a", "b", "c"], ["a", "a", "b", "c"]) → 16
checkExam(["b", "c", "b", "a"], ["",  "a", "a", "c"]) → 0

solution

	<script type="text/javascript">
 		function checkExam(array1, array2) {
 			// console.log(array1,array2);
 			var correct = 0;
 			var error = 0;
 			var other = 0;
 			for(var i=0;i<array1.length;i++){
 				if(array1[i] == array2[i]){
 					correct ++;
 				}else if(array2[i] == ''){
 					other = 0;
 				}else{
 					error ++;
 				}
 			}
 			// console.log(correct,error);
 			var result = correct * 4 + error * (-1) + other;
 			if(result <0){
 				return 0;
 			}
 			return result;
 		}
 		
		验证
		console.log(checkExam(["a", "a", "b", "b"], ["a", "c", "b", "d"]));// 6
		console.log(checkExam(["a", "a", "c", "b"], ["a", "a", "b",  ""]));//7
		console.log(checkExam(["b", "c", "b", "a"], ["",  "a", "a", "c"]));//0
	</script>

【2】<7kyu>【Love vs friendship】

If　a = 1, b = 2, c = 3 ... z = 26

Then l + o + v + e = 54

and f + r + i + e + n + d + s + h + i + p = 108

So friendship is twice stronger than love 😃

The input will always be in lowercase and never be empty.

example：

wordsToMarks("attitude")// 100
wordsToMarks("friends")//75

solution

<script type="text/javascript">
 		function wordsToMarks(string){
 			var arr = [];
 			var count = 0;
 			for(var i=0;i<string.length;i++){
 				// 获取到string每个字母的大小，放入到新数组中
 				var temp = string.substring(i,i+1).charCodeAt()-96;
 				arr.push(temp);
 			}
 			// console.log(arr);
 			for(var j=0;j<arr.length;j++){
 				count += arr[j];
 			}
 			return count;
 		}
 		
		// 验证
		console.log(wordsToMarks("attitude"));// 100
		console.log(wordsToMarks("friends"));//75
	</script>

【3】<7kyu>【Remove anchor from URL】

Complete the function/method so that it returns the url with anything after the anchor (#) removed.

example：

// returns 'www.codewars.com'
removeUrlAnchor('www.codewars.com#about')

// returns 'www.codewars.com?page=1' 
removeUrlAnchor('www.codewars.com?page=1') 

solution

<script type="text/javascript">
 		function removeUrlAnchor(url){
 			var index = url.indexOf('#');
 			// console.log(index);
 			if(index !=-1){
 				 url = url.substring(0,index);
 			}
 			return url;
 		}
 		
		// 验证
		console.log(removeUrlAnchor("www.codewars.com#about"));// www.codewars.com
		console.log(removeUrlAnchor("www.codewars.com?page=1"));//www.codewars.com?page=1
	</script>

以上为自己思路供大家参考，可能有更优的思路。