CodeWARS Exercise (JavaScript) -2021/4/9

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- - 2021/4/9

CodeWars-JS exercise

2021/4/9

Github address

My Github Address, I have the exercise record on it, constantly updating ...

【1】<7kyu>【Slaphead】

Shaving the clean hair "-" means that the scattered hair is "/". Your task is to check if the head has scattered hair and removes them.

example：

0 hairs --> "Clean!"
1 hair --> "Unicorn!"
2 hairs --> "Homer!"
3-5 hairs --> "Careless!"
>5 hairs --> "Hobo!"


 "------/------" you shoud return:
["-------------", "Unicorn"]

solution

<script type="text/javascript">
	function bald(x){
		console.log(x)	
		var len = x.length;
		var s = x.match(/[/]/g);
		var temp = [];
		if(s == null) return [x,'Clean!']
		var num = s.length;
		for(var i=0;i<len;i++){
			temp.push('-');
		}
		var str = temp.join('');
		var result = [str];
		if(num == 0)result.push('Clean!');
		else if(num == 1)result.push('Unicorn!')
		else if (num == 2)result.push('Homer!')
		else if (num>=3&& num<=5)result.push('Careless!')
		else result.push('Hobo!')		
		return result;
	}
	// verify
	// console.log(bald('/---------'));// ['----------', 'Unicorn!']
	// console.log(bald('/-----/-'));//['--------', 'Homer!']
	// console.log(bald('--/--/---/-/---'));// ['---------------', 'Careless!']
	console.log(bald('-----'));//['----','Clean!']
</script>

【2】<6kyu>【Handshake problem】

Johnny wants to understand the number of participants this year by calculating all the number of handshakes.

This function acquires the number of handshakes and returns the minimum number of minimal people required to perform these handshakes (a pair of farmers only shake it once).

Hold a handshake	Minimum number of people
0	1
1	2
3	3
6	4

example：

6//4
7//5

solution

<script type="text/javascript">
	function getParticipants(handshakes){
		// console.log(handshakes)
		x = (1 + Math.sqrt(1+8*handshakes))/2
		return Math.ceil(x)
	}
	// verify
	console.log(getParticipants(0));// 1
	console.log(getParticipants(1));// 2
	console.log(getParticipants(3));//3
	console.log(getParticipants(6));//4
	console.log(getParticipants(7));//5
</script>

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