① array数组去重 var arr1 = [1,5,5,6,8,8,9];function unique (array) {var arr2 = [];for(var i = 0;i < arr1.length;i++){if(arr2.indexOf(arr1[i]) == -1){arr2.push(arr1[i]);}}return arr2;}console.log(unique(arr1)); //[1, 5, 6, 8, 9]
② array以原生链的方式数组去重,按从小到大排序 var arr1 = [5,5,1,8,8,6,9];Array.prototype.unique = function () {this.sort();var arr2 = [this[0]];for(var i=1;i<this.l...
Array push is used to add elements to the end of an Array. In this lesson we‘ll see how the push method accepts multiple arguments, can be used to merge two arrays,. Push can accept multi args:const pets = ["dog", "hamster"];
pets.push("cat");
console.log(pets); //["dog", "hamster", "cat"]
pets.push("brid", "horse");
console.log(pets); //["dog", "hamster", "cat", "brid", "horse"] Push can merge t...
在日程工作中经常会遇到这样的问题 一个JS数组 我们要找出其中 一些符合要求的类容又或者对数组里的类容求和求平均数之类的一般的做法是循环里面的类容做判断添加到一个新的集合里var array = [];array.push(1);array.push(2);array.push(3);array.push(4);array.push(5);array.push(6);var whereArray = [];for(var model in array){if(model<3) {whereArray.push(model);}} 如果需要做查询的代码多了我们就不得不写非常多的循...
迁移时间:2017年5月25日08:05:33
UpdateTime--2017年3月31日16:29:08(二)数组(Array)1.用法//js声明数组的两大类方式
// 第一类(通常使用)var array1 = [];//初始化var array2 = [1,2,3];//声明并赋值
array2[2] = 4;//指定固定位置数组元素的值
array2.push(6);//1,2,4,6
// 第二类var array3 = new Array();
array3.push("张三");
var array4 = new Array(3);//声明数组并指定长度
array4[0] = "张三";
array4.push("name...
1、boolean equals(array1,array2):比较两个数组是否相等。import java.util.Arrays;public class Ch03 { public static void main(String[] args) { // TODO Auto-generated method stub String[] str1={"1","2","3"}; String[] str2={"1","2",new String("3")}; System.out.println(Arrays.equals(str1, str2));//结果是:true }}2、void sort(array):对数组array的元素进行升序排列 //给一个数组进行排序 ...
[20141121]JavaScript之Array常用功能汇总*:first-child {margin-top: 0 !important;
}body>*:last-child {margin-bottom: 0 !important;
}/* BLOCKS
=============================================================================*/p, blockquote, ul, ol, dl, table, pre {margin: 15px 0;
}/* HEADERS
=============================================================================*/h1, h2, h3, h4, h5, h6 {margin: 20p...
//完美去除法:var arr=[1,3,2,2,11,4];
var arr1=[];
var arr2=arr.sort(function(a,b){return a-b;
}); //把数组进行排序var num=1;
for (var i=0;i<arr2.length;i++){if(arr2[i]!==arr2[(num++)]){arr1.push(arr[i]);}
}
console.log(arr1); 原文:http://www.cnblogs.com/weven/p/7183191.html
引用类型Object类型function a(num){if(num>3){a(--num); }console.log(num); }a(5);//如何创建对象的实例var obj1= new Object();console.log(obj1);obj1.name="吴琼";obj1.age=28;console.log(obj1.name+" "+obj1.age);//对象字面量语法 ,有点封装的感觉var obj2 = {name:"吴琼",age:28};var obj3 = {age:28,age_wo:30};console.log(obj3["age_wo"]);console.log(obj2.name+" "+obj2.age);function show(arg){var s="";if(ar...
JS的类型数组大体可分为3类:无符号整数、有符号整数、浮点数。Int8Array; Uint8Array; Uint8ClampedArray; Int16Array; Uint16Array; Int32Array; Uint32Array; Float32Array; Float64Array;基本上都可以望文生义,看名字就知道怎么回事。但是有一个例外 Uint8ClampedArray ,它与 Uint8Array 颇为相似,但又有所区别。因为颜色数据刚好都是符合8位二进制的无符号整数,所以这两个类型在处理Canvas绘图数据时常常用到。Uint8Clamp...
Warning: Unchecked cast from object to array list本文地址:http://blog.csdn.net/caroline_wendy警告发生在对象(Object)强制转换为数组(ArrayList)类型,如:infos = (ArrayList<VideoInfo>) data.getData();因为对象转换为数组类型,未经过检查,有一定危险.使数组对象强制转换,如ArrayList<?>,比较容易控制风险。但是,为了书写简便和适配其他不规范接口,这么做是可以的。可以在方法(method)前,进行警告抑制(SuppressWarn...
题目:
Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length.
Do not allocate extra space for another array, you must do this in place with constant memory.
For example,
Given input array nums = [1,1,2],
Your function should return length = 2, with the first two elements of nums being 1 and 2 respectively.It doesn‘t matter what you ...
publicclass Test
{publicstaticvoid main (String[] args){String[] a = {"roll out", "rule out", "normalcy", "palaver", "satirical", "rut"};//下面提供两种遍历array的方法://第一种方法:for (int i = 0; i < a.length; i++){System.out.println(a[i]);}System.out.println(); //遍历后,换行//第二种方法:for (String item : a){System.out.println(item);}}
} 原文:https://www.cnblogs.com/profesor/p/12924934.html
转载:http://blog.csdn.net/teresa502/article/details/7926796代码:// 删除数组中重复数据function removeDuplElem(array){ for(var i=0; i<array.length; i++){for(var j=i+1; j<array.length;j++){if(array[i]==array[j]){array = removeElement(j,array);//删除指定下标的元素i=-1;break;}} }return array;
}
//删除数组 用到的函数function removeElement(index,array){if(index>=0 && index<array.length){for(var i...
Patching ArrayGiven a sorted positive integer array nums and an integer n, add/patch elements to the array such that any number in range [1, n] inclusive can be formed by the sum of some elements in the array. Return the minimum number of patches required.Example 1:nums = [1, 3], n = 6Return 1.Combinations of nums are [1], [3], [1,3], which form possible sums of: 1, 3, 4.Now if we add/patch 2 to n...
题目难度:Easy题目:Given a sorted array, remove the duplicates in-place such that each element appear only once and return the new length.Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.翻译:给定一个排好序的数组后,删除重复的元素,这样每个元素只出现一次,并返回新的长度。不要新建另一个数组分配额外的空间,只能通过修改原有...