使用yield和函数式编程转换数组 // 对Array进行转换,获取的还是Array val a = Array(1, 2, 3, 4, 5) val a2 = for (ele <- a) yield ele * ele // 对ArrayBuffer进行转换,获取的还是ArrayBuffer val b = ArrayBuffer[Int]() b += (1, 2, 3, 4, 5) val b2 = for (ele <- b) yield ele * ele // 结合if守卫,仅转
function rand(arr) { var len = arr.length //首先从最大的数开始遍历,之后递减 for(var i = arr.length - 1; i >= 0; i--) { //随机索引值randomIndex是从0-arr.length中随机抽取的 var randomIndex = Math.floor(Math.random() * (i + 1)); //下面三句相当于把从数组中随机抽取到的值与当前遍历的值互换位置 var itemIndex = arr
Shuffle a set of numbers without duplicates. Example: // Init an array with set 1, 2, and 3. int[] nums = {1,2,3}; Solution solution = new Solution(nums); // Shuffle the array [1,2,3] and return its result. Any permutation of [1,2,3] must equally lik