[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8},"actionData","errors","root",{"_11":-5},"routes/user.$name.topics",{"_9":10,"_11":12,"_13":14,"_15":16,"_17":18,"_19":20},"topics",[36,37],"user",{"_21":22,"_13":14,"_23":24,"_25":26,"_27":28,"_29":30,"_31":32,"_33":20,"_34":35},"loginname","gaofei1974","page",1,"limit",20,"total",2,"id","17957","avatar_url","https://avatars3.githubusercontent.com/u/11519004?v=4","githubUsername","RyanGf","create_at","2015-07-17 09:16:12.357","score",25,"topic_count",3,"reply_count","is_star",false,{"_21":55,"_39":22,"_40":41,"_42":56,"_44":57,"_46":58,"_48":35,"_49":35,"_33":59,"_51":60,"_27":61,"_53":62},{"_21":38,"_39":22,"_40":41,"_42":43,"_44":45,"_46":47,"_48":35,"_49":35,"_33":50,"_51":52,"_27":47,"_53":54},"27340","author_id","tab","share","content","### 一、翻转字符串 ( Reverse a String )\r\n_例子：reverseString(\"hello\") //返回 \"olleh\"_\r\n#### 代码\r\n```javascript\r\n//递归算法\r\nfunction reverseString(str) {\r\n return str.length ? reverseString(str.substr(1))+str.charAt(0) : \"\";\r\n}\r\nreverseString(\"hello\");\r\n```\r\n### 二、阶乘 ( Factorialize a Number )\r\n_例子： 5! = 1 * 2 * 3 * 4 * 5 = 120_\r\n#### 代码\r\n```javascript\r\n//递归算法\r\nfunction factorialize(num) {\r\n return num !== 0 ? num * factorialize(num-1) : 1;\r\n}\r\n/*\r\n//for循环\r\nfunction factorialize(num) {\r\n var result = 1;\r\n for (var i=2; i<=num; i++) {\r\n result *= i;\r\n }\r\n return result;\r\n}\r\n*/\r\nfactorialize(5);\r\n```\r\n### 三、检查回文字符串 ( Check for Palindromes )\r\n如果一个字符串忽略标点符号、大小写和空格，正着读和反着读一模一样，那么这个字符串就是palindrome(回文)。\r\n_例子：palindrome(\"race car\") //返回 true._\r\n#### 代码\r\n```javascript\r\nfunction palindrome(str) {\r\n str = str.replace(/[\\W_]/g, \"\").toLowerCase();\r\n return str.split(\"\").reverse().join(\"\") === str; \r\n}\r\n/*\r\n// for 循环\r\nfunction palindrome(str) {\r\n str = str.replace(/[\\W_]/g,\"\").toLowerCase();\r\n var stop = str.length-1;\r\n for (var i=0; i arr.length>0 ? [Math.max.apply(null, arr.shift())].concat(largestOfFour(arr)) : [];\r\nlargestOfFour([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]]);\r\n```\r\n### 七、检查字符串结尾 ( Confirm the Ending )\r\n判断一个字符串(str)是否以指定的字符串(target)结尾。\r\n_例子: confirmEnding(\"He has to give me a new name\", \"name\") //返回 true_\r\n#### 代码\r\n```javascript\r\nfunction confirmEnding(str, target) {\r\n return str.substr(-target.length) === target;\r\n}\r\nconfirmEnding(\"Bastian\", \"n\");\r\n```\r\n### 八、重复输出字符串 ( Repeat a string repeat a string )\r\n重复一个指定的字符串 num次，如果num是一个负数则返回一个空字符串。\r\n_例子: repeat(\"*\", 3) //返回 \"***\"_\r\n#### 代码\r\n```javascript\r\n// 递归\r\nfunction repeat(str, num) {\r\n return num > 0 ? str + repeat(str, num-1) : \"\"; \r\n}\r\nrepeat(\"abc\", 3);\r\n```\r\n### 九、截断字符串 ( Truncate a string )\r\n( 用瑞兹来截断对面的退路 ) 如果字符串的长度比指定的参数num长，则把多余的部分用...来表示。但是，如果指定的参数num小于或等于3，则添加的三个点号不会计入字符串的长度。\r\n_例子: truncate(\"A-tisket a-tasket A green and yellow basket\", 11) //返回 \"A-tisket...\"_\r\n#### 代码\r\n```javascript\r\nfunction truncateString(str, num) {\r\n if (str.length > num) {\r\n if (num <= 3) str = str.substr(0,num);\r\n else str = str.substr(0,num-3);\r\n str += '...';\r\n }\r\n return str;\r\n}\r\ntruncateString(\"Absolutely Longer\", 2);\r\n```\r\n### 十、分割数组\r\n把一个数组arr按照指定的数组大小size分割成若干个数组块。\r\n_例子: chunk([\"a\", \"b\", \"c\", \"d\"], 2) //返回 [[\"a\", \"b\"], [\"c\", \"d\"]]_\r\n#### 代码\r\n```javascript\r\nfunction chunk(arr, size) {\r\n var result = [], i=0;\r\n while (i-1;\r\n });\r\n}\r\nmutation([\"hello\", \"hey\"]);\r\n```\r\n### 十三、过滤数组假值 ( Falsy Bouncer )\r\n删除数组中的所有假值。在JavaScript中，假值有false、null、0、\"\"、undefined 和 NaN。\r\n_例子: bouncer([7, \"ate\", \"\", false, 9]) //返回 [7, \"ate\", 9]_\r\n#### 代码\r\n```javascript\r\nfunction bouncer(arr) { \r\n return arr.filter(function(val){return val;}); \r\n}\r\nbouncer([7, \"ate\", \"\", false, 9]);\r\n```\r\n### 十四、摧毁数组 ( Seek and Destroy )\r\n金克斯的迫击炮！\r\n实现一个摧毁(destroyer)函数，第一个参数是待摧毁的数组，其余的参数是待摧毁的值。\r\n_例子: destroyer([1, 2, 3, 1, 2, 3], 2, 3) //返回 [1, 1]_\r\n#### 代码\r\n```javascript\r\nfunction destroyer(arr) {\r\n var args = [];\r\n for (var i = 1; i < arguments.length; i++) args.push(arguments[i]);\r\n return arr.filter(function(val) {\r\n return args.indexOf(val)===-1;\r\n });\r\n}\r\n/*\r\nfunction destroyer(arr) { \r\n // 转换数组\r\n var thisArg = Array.prototype.slice.apply(arguments); \r\n thisArg.shift();\r\n return arr.filter(function(val) { \r\n return thisArg.indexOf(val) === -1; \r\n });\r\n}\r\n*/\r\ndestroyer([\"tree\", \"hamburger\", 53], \"tree\", 53);\r\n```\r\n### 十五、数组排序并找出元素索引 ( Where do I belong )\r\n先给数组排序，然后找到指定的值在数组的位置，最后返回位置对应的索引。\r\n_例子: where([10, 20, 30, 40, 50], 35) //返回 3_\r\n#### 代码\r\n```javascript\r\nfunction where(arr, num) { \r\n return arr.reduce(function(prev, curr){\r\n return curr=Acode && cc<=Zcode) {\r\n cc += 13;\r\n if (cc>Zcode) cc-=NUMLETTERS;\r\n }\r\n return String.fromCharCode(cc);\r\n });\r\n}\r\n/*\r\nfunction rot13(str) {\r\n return str.split(\"\").map(function(char){\r\n var cc = char.charCodeAt(0);\r\n return (cc>64 && cc<91) ? String.fromCharCode(cc%26+65) : char;\r\n }).join(\"\");\r\n}\r\n*/\r\n// Change the inputs below to test\r\nrot13(\"SERR PBQR PNZC\");\r\n```","title","Javascript 学习笔记—初级算法","last_reply_at","2017-08-23 08:57:24.68","good","top",0,"visit_count",3904,"author",{"_13":14,"_23":24},"27493","##### 教程说明\r\n> 本教程参照 [CodeCasts的\"PhpStorm 使用教程\"](https://www.codecasts.com/series/master-phpstorm)。phpstorm和webstorm都是[JetBrains](http://www.jetbrains.com/)的IDE产品，所以配置和操作有相同之处。我把相关知识点记录一下，方便日后查询。在此特别推荐一下[CodeCasts](https://www.codecasts.com)网站的视频教程，站长蛮用心的\r\n\r\n我使用的是Mac系统，快捷键与Windows系统不同，以下快捷键以Mac为准。\r\n##### Mac 和 Windows键盘对照表\r\n| Mac | Windows |\r\n|:------|:-----------|\r\n| Control | Ctrl |\r\n| Command | 徽标键 |\r\n| Option | Alt |\r\n超级快捷键 Command+Shift+A：可以搜索到 WebStorm的所有配置选项\r\n#### 一、界面优化\r\n##### 去掉相关的 Bar\r\n 在菜单栏的view下勾掉所有的 Bar (Status Bar、Navigation Bar等)。\r\n##### 去掉标签 (Tabs Placement)\r\n 右击标签，选择Tabs Placement -> none，如果想显示， Command+Shift+A下搜索Tabs Placement后选择显示位置。\r\n##### 去掉面包屑导航\r\n Command+Shift+A下搜索 breadcrumbs，选择Don't Show。\r\n##### 去掉代码折叠轮廓线\r\n Command+Shift+A下搜索 Code Folding，取消 code folding outline。\r\n\t 快捷键：Command++(展开)、Command+-(折叠)\r\n##### 去掉代码分割线(此项有疑问，后续再修改)\r\n Command+Shift+A下搜索 show method separators并取消。\r\n##### 显示和隐藏SideBar\r\n 使用Command+1 显示和隐藏SideBar。\r\n##### 去掉左边竖线\r\n Command+Shift+A下搜索 show right margin(configured in Code Style options)并取消。\r\n##### 美化界面和字体设置\r\n - 主题设置：Command+, 打开偏好设置，依次选择 Editor -> Color Scheme (我使用Mokonai)\r\n\t - 字体设置：Command+, 打开偏好设置，依次选择 Editor ->Font (我使用Fira Code、字体大小16、字间距1.4)\r\n\t - SideBar 字体设置：Command+Shift+A下搜索override default fonts by...,勾选后选择字体和设置大小\r\n#### 二、重要的快捷键\r\n##### 自定义快捷键\r\n Command+Shift+A下搜索keymap，查找需要修改的快捷键，进行修改。查找时可以直接输入需要修改的项目名称，也可以输入项目之前的快捷键。\r\n##### 快捷键列表\r\n - 快速查找和打开文件：Command+P（默认是Command+Shift+O）\r\n\t - 显示指定对象的属性和方法 (File Structure)：Control+Command+M (默认是Command+F12)\r\n\t - 在已打开的文件中快速跳转：Command+E\r\n\t - 快速查找和打开对象或方法：Command+Option+O\r\n\t - 快速创建文件或文件夹：Command+Up后选择对应的文件夹，再Command+N，创建文件或文件\r\n\t - 偏好设置 (preference)：Command+,\r\n#### 三、文件模板（File Template）\r\n Command+Shift+A下搜索File Template, 配置和添加文件模板。\r\n#### 四、代码片段（Live Templates）\r\n Command+Shift+A下搜索Live Templates [preferences], 配置和添加代码片段。\r\n#### 五、代码的格式化及美化（Live Templates）\r\n - Command+Option+L：格式化代码\r\n\t - Command+Shift+A下搜索Code Style，这里可自定义代码格式 \r\n#### 六、插件（Live Templates）\r\n - IdeaVim：安装启用后可使用vim方式编写代码\r\n#### 七、代码重构\r\n 选择需要重构的代码段，Control+T 呼出菜单，选择重构方式，也可使用快捷键直接进行重构操作\r\n\t - Command+Option+V：变量重构 (Varibale)\r\n\t - Command+Option+M：方法重构 (Method)\r\n\t - Command+Option+N: 对变量或方法的重构还原 (inline)\r\n#### 八、多点编辑 (相同的单词同时编辑)\r\n - Command+D: 逐个选择单词 (默认快捷键Control+G)\r\n\t - Control+Command+G：选择全部的单词","WebStorm使用教程","2017-09-03 15:04:00.237",7,13317,"2017-09-01 02:03:42.549",{"_13":14,"_23":24}]