codewars练习（javascript）-2021/2/16

codewars-js练习

2021/2/16

github 地址

my github地址，上面有做的习题记录，不断更新…

【1】<8kyu>【Transportation on vacation】

Every day you rent the car costs $40. If you rent the car for 7 or more days, you get $50 off your total. Alternatively, if you rent the car for 3 or more days, you get $20 off your total.

Write a code that gives out the total amount for different days(d).

你租这辆车每天要花40美元。如果你租车7天或更长时间，你可以得到50美元的折扣。或者，如果你租车3天以上，你可以得到20美元的折扣

example：

rentalCarCost(1), 40)
rentalCarCost(2), 80)
rentalCarCost(5), 180)
rentalCarCost(10), 350)

solution

<script type="text/javascript">
 		function rentalCarCost(d) {
 			// console.log(d);
 			if(d >=7){
 				return (d*40)-50;
 			}else if(d >= 3 && d <7){
 				return (d*40)-20;
 			}else{
 				return d*40;
 			}
 		}
 		
		// 验证
		console.log(rentalCarCost(1));//40
		console.log(rentalCarCost(10));//350
		console.log(rentalCarCost(5));//180
		console.log(rentalCarCost(3));//100
	</script>

【2】<8kyu>【Century From Year】

The first century spans from the year 1 up to and including the year 100, The second - from the year 101 up to and including the year 200, etc.

Given a year, return the century it is in.

第一个世纪从公元1年到公元100年，第二，从公元101年到公元200年，等等。

example：

centuryFromYear(1705)  returns (18)
centuryFromYear(1900)  returns (19)
centuryFromYear(1601)  returns (17)
centuryFromYear(2000)  returns (20)

solution

	<script type="text/javascript">
 		function century(year) {
 			// console.log(year);
 			return Math.ceil(year/100);
 		}
 		
		// 验证
		console.log(century(1705));//18
		console.log(century(1900));//19
		console.log(century(1601));//17
		console.log(century(2000));//20
		console.log(century(89));//1
	</script>

【3】<8kyu>【Function 3 - multiplying two numbers】

Implement a function which multiplies two numbers.

example：

2*3 = 6

solution

<script type="text/javascript">
 		function multiply(a,b){
 			return a*b;
 		}
 		
		// 验证
		console.log(multiply(2, 3));// 6
	</script>

【4】<8kyu>【Filter out the geese】

Write a function, gooseFilter/goose_filter/GooseFilter, that takes an array of strings as an argument and returns a filtered array containing the same elements but with the ‘geese’ removed.

The geese are any strings in the following array, which is pre-populated in your solution:

 var geese = ["African", "Roman Tufted", "Toulouse", "Pilgrim", "Steinbache"];

编写一个函数gooseFilter/goose_filter/ gooseFilter，它接受一个字符串数组作为参数，并返回一个过滤后的数组，该数组包含相同的元素，但去掉了’geese’。

example：

["Mallard", "Hook Bill", "African", "Crested", "Pilgrim", "Toulouse", "Blue Swedish"]//["Mallard", "Hook Bill", "Crested", "Blue Swedish"]

solution

<script type="text/javascript">
 		function gooseFilter (birds) {
  			var geese = ["African", "Roman Tufted", "Toulouse", "Pilgrim", "Steinbacher"];
  			// console.log(birds);
  			for(var i=0;i<birds.length;i++){
  				for(var j=0;j<geese.length;j++){
  					if(birds[i] == geese[j]){
  						birds.splice(i,1);
  						i=i-1;
  					}
  				}
  			}
  			return birds;

		};
 		
		// 验证
		console.log(gooseFilter(["Mallard", "Hook Bill", "African", "Crested", "Pilgrim", "Toulouse", "Blue Swedish"]));// ["Mallard", "Hook Bill", "Crested", "Blue Swedish"]
	</script>

以上为自己思路供大家参考，可能有更优的思路。