codewars练习（javascript）-2021/4/14

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本文记录了作者在2021年4月14日进行的JS Codewars练习，包括检查句子中是否包含'english'的正则表达式，过滤指定长度以上单词，按规律分配数值给乞丐，根据年龄推荐饮品，判断投篮次数达标情况以及计算免税商品数量。通过这些练习，展示了基础的JavaScript编程技巧和问题解决能力。

文章目录

- codewars-js练习
- - 2021/4/14

codewars-js练习

2021/4/14

github 地址

my github地址，上面有做的习题记录，不断更新…

【1】<8kyu>【Do you speak “English”?】

solution

<script type="text/javascript">
	function spEng(sentence){
		console.log(sentence)
		return (/english/i).test(sentence)
	}
	
	// 验证
	console.log(spEng("english"));//true
	console.log(spEng("egnlish"));//false
</script>

【2】<7kyu>【Filter Long Words】

返回一个包含所有长于n的单词的列表。

example：

filterLongWords("The quick brown fox jumps over the lazy dog", 4) = ['quick', 'brown', 'jumps']

solution

<script type="text/javascript">
	function filterLongWords(sentence, n) {
		console.log(sentence,n)
		var arr = sentence.split(' ');
		var result = [];
		for(var i=0;i<arr.length;i++){
			if(arr[i].length >n){
				result.push(arr[i]);
			}
		}
		return result
	}
</script>

【3】<6kyu>【English beggars】

给定一组值和一个乞丐,你应该返回一个数组,每个乞丐带回家的总和,假设他们都进行有规律的转动,从第一个到最后一个。

example：

For example: [1,2,3,4,5] for 2 beggars will return a result of [9,6], as the first one takes [1,3,5], the second collects [2,4].
The same array with 3 beggars would have in turn have produced a better out come for the second beggar: [5,7,3], as they will respectively take [1,4], [2,5] and [3].

solution

<script type="text/javascript">
	function beggars(values, n){
		console.log(values,n)
		var outputValues = [];
		for (var i = 0; i < n; i++) {
			var sum = 0;
			for (var j = i; j < values.length; j += n) {
		  		sum += values[j];
			}
			outputValues.push(sum);
		}
		return outputValues;
	}
	
	// 验证
	console.log(beggars([1,2,3,4,5],1));//[15]
	console.log(beggars([1,2,3,4,5],2));//[9,6]
	console.log(beggars([1,2,3,4,5],3));//[5,7,3]
	// console.log(beggars([1,2,3,4,5],6));//[1,2,3,4,5,0]
	// console.log(beggars([1,2,3,4,5],0));//[]
</script>

【4】<8kyu>【Drink about】

Children under 14 old.
Teens under 18 old.
Young under 21 old.
Adults have 21 or more.

example：

13 --> "drink toddy"
17 --> "drink coke"
18 --> "drink beer"
20 --> "drink beer"
30 --> "drink whisky"

solution

<script type="text/javascript">
	function peopleWithAgeDrink(old) {
		console.log(old)
		if(old<14)return 'drink toddy';
		else if(old<18 && old>=14) return "drink coke";
		else if(old<21 && old>=18) return "drink beer";
		else return "drink whisky";
	}
	
	// 验证
	console.log(peopleWithAgeDrink(22));//'drink whisky'
</script>

【5】<8kyu>【Keep up the hoop】

-If Alex gets 10 or more hoops, return the string “Great, now move on to tricks”.

-If he doesn’t get 10 hoops, return the string “Keep at it until you get it”.

solution

<script type="text/javascript">
	function hoopCount (n) {
		console.log(n)
		if(n<10) return "Keep at it until you get it" ;
		else return "Great, now move on to tricks"
	}
	
	// 验证
	console.log(hoopCount(3));//"Keep at it until you get it" 
	console.log(hoopCount(11));//"Great, now move on to tricks"
</script>

【6】<8kyu>【Holiday VIII - Duty Free】

example：

12, 50, 1000// 166  --> 12 * 0.5=6 ---> 1000/6

solution

<script type="text/javascript">
	function dutyFree(normPrice, discount, hol){
		console.log(normPrice,discount,hol)
		return Math.floor(hol / (normPrice * (discount/100)))
	}
	
	// 验证
	console.log(dutyFree(12, 50, 1000));// 166
	console.log(dutyFree(17, 10, 500));// 294
	console.log(dutyFree(24, 35, 3000));// 357
</script>