codewars练习（javascript）-2021/3/31_codewars js count the monkeys!-优快云博客

这篇博客记录了两道JavaScript Codewars练习，分别为8kyu的'Counting Sheep'和5kyu的'Pete, the Baker'。'Counting Sheep'题目要求计算真值数组中`true`的数量，而'Pete, the Baker'则要求根据食材配方和库存计算最大可制作蛋糕数。解决方案中展示了如何通过遍历和匹配方法解决计羊问题，以及通过配料比例计算蛋糕数量的方法。

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文章目录

- codewars-js练习
- - 2021/3/31

codewars-js练习

2021/3/31

github 地址

my github地址，上面有做的习题记录，不断更新…

【1】<8kyu>【Counting sheep】

example：

[true,  true,  true,  false,
  true,  true,  true,  true ,
  true,  false, true,  false,
  true,  false, false, true ,
  true,  true,  true,  true ,
  false, false, true,  true]//17

solution

<script type="text/javascript">
	function countSheeps(arrayOfSheep) {
		console.log(arrayOfSheep)
		var str = arrayOfSheep.join('');
		var arr = str.match(/true/gi);
		console.log(arr==null)
		return arr!=null?arr.length:0;
	}

    // 验证
    array1 = [true,  true,  true,  false,
              true,  true,  true,  true ,
              true,  false, true,  false,
              true,  false, false, true ,
              true,  true,  true,  true ,
              false, false, true,  true ];
   	array2 = [null,null,null,null,null,null,null]

  
    console.log(countSheeps(array1));//17
    console.log(countSheeps(array2));//0
</script>

【2】<5kyu>【Pete, the baker】

编写一个函数cakes()，该函数接受配方(对象)和可用的配料(也是一个对象)，并返回Pete可以烘烤的蛋糕的最大数量(整数)

example：

// must return 2
cakes({flour: 500, sugar: 200, eggs: 1}, {flour: 1200, sugar: 1200, eggs: 5, milk: 200}); 
// must return 0
cakes({apples: 3, flour: 300, sugar: 150, milk: 100, oil: 100}, {sugar: 500, flour: 2000, milk: 2000});

solution

<script type="text/javascript">
	function cakes(recipe, available) {
		// console.log(recipe,available)
		var arr = [];
		for(var i in recipe){
			// console.log(i)
			// console.log(i in available)
			if(i in available){
				arr.push(Math.floor(available[i]/recipe[i]))
			}
			else return 0
		}
		return Math.min(...arr)
	}

    // 验证
    recipe = {flour: 500, sugar: 200, eggs: 1};
    available = {flour: 1200, sugar: 1200, eggs: 5, milk: 200};
    console.log(cakes(recipe, available));//2

    recipe = {apples: 3, flour: 300, sugar: 150, milk: 100, oil: 100};
    available = {sugar: 500, flour: 2000, milk: 2000};
    console.log(cakes(recipe, available));// 0
</script>