codewars for beginners

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Codewars can learn.

Http://www.codewars.com/kata/54ff3102c1bad923760001f3/solutions/csharpDetermines how many a given string has a E i o uusing System; using System.Linq; Public Static class kata{ publicstaticint getvowelcount (string str) { return"aeiou". INDEXOF (x)! =-1); }} Public Static classkata{ Public Static intGetvowelcount (stringstr) { returnStr. Where (c =New[] {'a','e','I','o','u'}. Any (v = v = =c)). Count (); }}http://www.codewars.com/kata/5506b230a11c0aeab3000c1fusing Syst

Js--codewars--human readable Time-math object, parseint ()

); Discard the fractional part, preserving the whole number of parts 2 Math.ceil (5/2); Rounding up, with decimals on the entire number of parts +1 3 Math.Round (5/2); Rounded 3 Math.floor (5/2); Rounding down 2 1, conversion function (valid for string type, otherwise non)parseint ()//Convert a string to an integerparseint ("123blue"); Return 123parseint ("22.5"); return 22Parsefloat ()//Convert a str

PARTITION (number theory) ALSO explosive number in Codewars

The problem is codewars, in short: finding and combining different integers for an integer. Https://en.wikipedia.org/wiki/Partition_ (Number_theory)For example: The combination of integers with 6 has the following 11 kinds,65 + 14 + 24 + 1 + 13 + 33 + 2 + 13 + 1 + 1 + 12 + 2 + 22 + 2 + 1 + 12 + 1 + 1 + 1 + 1 + 11 + 1 + 1 + 1 + 1 + 1Solution One:To avoid repetition, we can choose to gradually decrement the first addend until it is not less than half of

The subject is poisonous but Codewars OJ System (II)

relevant answers on the web and find a solution for a big guy: function Guessexpression (exp) {let m = Exp.match ([\w\d]+)/g); Let sym = [m[0], m[1]]; Let res = +m[2]; Let Uniq = (Sym[0] + sym[1]). Split (") . Filter (EL, I, arr) => Arr.indexof (el, i+1) = = 1); Let nums = new Array (uniq.length). Fill (1); Brute Force while (1) {let a = Sym[0].replace (/./g, C => Nums[uniq.indexof (c)]); Let B = Sym[1].replace (/./g, C => Nums[uniq.indexof (c)]); if ((+a) * (+b

[Codewars] [JS] How to determine whether a given number is an integer

convenient, here just to occupy bits.So the question is, how do you tell if a number is an integer?Before I play this problem, I know there are these methods:A>math.floor (num) = = numRounding a given number, or an integer if it is equal to the original number.B>parseint (num) = = numThe same as above, just using a different approachC> "^-?//d+$"Of course, you can also use powerful regular expressions.After I finished this problem, I realized that there was a more concise form:D>num = = num | 0

Codewars--js--large factorials--factorial + large number factorial

store each digit, and the basic solution method can be analogous to the math multiplication in primary school. (When 24*5, first with the 4*5 20, the single digit is 0, the carry is 2, and then 2*5+2 12, then 10 bits 2, carry 1,. The last is [0,2,1]. When the array is inverted, it is the multiplication result. )My answer:functionfactorial (n) {//Add Some code if(nreturn NULL;} if(N==0 | | N==1) {return"1";} Let result=[1]; //result Array Stores current factorial results for(Let num=2;num){

Js--codewars--write number in Expanded form-filters, map, reduce, ForEach

not possible to exit the loop itself; foreach is good for sparse matrix processing and does not process an empty array.(2) Comparison with mapHttps://www.cnblogs.com/liuruyi/p/6483526.htmlCommon:1. All loops iterate through each item in the array.Each execution of the anonymous function in 2.forEach () and map () supports 3 parameters: the current item in the array item, the index of the current item, and the original array input.3. This in the anonymous function refers to window.4. Only the ar

Learning routes and suggestions for PHP beginners, php beginners _ PHP Tutorial

It is applicable to PHP beginners and php beginners. This article describes the learning routes and suggestions for PHP beginners. for php beginners, [Guide] this article focuses on PHP learning issues! PHP Resource summary Daquan on Github, learning routes and suggestions for PHP

Css Beginners should pay attention to websites, css beginners websites

Css Beginners should pay attention to websites, css beginners websites Css can be understood as a Layout markup language. There is a foreign website called Learn CSS Layout. The usage of each type of css is displayed on the current page with css, which is detailed. Unlike other tutorials on the Internet, the content in Learn CSS Layout looks very easy. I think it may be due to the following reasons: 1. A ve

C ++ for beginners and C language for beginners

C ++ for beginners and C language for beginners I learned c a long time ago, but I forgot about it. Recently I am engaged in JNI and studied c ++. I found that it is very similar to Java. I just printed a 9-9 multiplication table with c ++. Haha // Print the multiplication tableVoid printMultiplication (){For (int I = 1; I For (int j = 1; j Cout }Cout }} The effect is as follows: 1*1 = 11*2 = 22*2 = 41*

PHP for beginners, Chinese name: yellow film for beginners. haha, I don't know if it will be blocked. on the first night, _ PHP Tutorial

PHP for beginners, Chinese name: porn for beginners. haha, I don't know if it will be blocked. The first night ,. New students learn PHP, Chinese name: new students learn porn film. haha, I don't know if it will be blocked. on the first night, my life will inevitably be boring. for me, I will soon graduate. Majoring in. net and a beginner in PHP, Chinese name: beginner takes porn film. haha, I don't know if

PHP for beginners, Chinese name: porn for beginners. Haha, I don't know if it will be blocked. The first night,

PHP for beginners, Chinese name: porn for beginners. Haha, I don't know if it will be blocked. The first night, Life is boring. For me, I will graduate soon. I majored in. net. It is very convenient for Microsoft to develop things, but the Code also needs to be changed. By the way, I will add a brick to my resume. Cainiao. . Now, let's move on to PHP. Now that we have already learned the basics of. net, it'

For python beginners, feel different from C. For python beginners

For python beginners, feel different from C. For python beginners I have been reading Python for more than half a month since the beginning. I have read Python core programming and Dive into Python. In other words, I read two books in half a month. I personally know that there are many small programs to be swallowed up. This is also because I have no need to use this book for large-scale development at the

Common HTML tags for beginners (3) List tags: html list tags for beginners

Common HTML tags for beginners (3) List tags: html list tags for beginners In the third blog, we are talking about inserting link tags. We usually see blue link tags, images, and emails on webpages, these are the functions of inserting the tags of The Link class. Mailto is also a feature of the Image Tag labels are essential in the production of web pages. To ensure the diversity and diversity of web pag

JQuery beginners (3): jquery beginners

JQuery beginners (3): jquery beginners 3. Events and animations A. Events Aa. DOM Loading 1. Why use jQuery to load the DOM method? Use the javascript window. the onload () method is required to load the DOM by waiting until all resources on the requested page are loaded to add event behavior to the DOM element. jquery only needs to load the DOM element, bind the event immediately 2. Form: $ (Function (){

Ajax for beginners. ajax for beginners

Ajax for beginners. ajax for beginners I. Ajax introduction, advantages and disadvantages, application scenarios and technologies Ajax introduction: Asynchronous Javascript And XML (Asynchronous JavaScript And XML) It is not a single technology, but a combination of a series of interactive web application technologies. AJAX is a technology used to create fast dynamic web pages. By performing a small amount

Swift beginners-advanced syntax and swift beginners

Swift beginners-advanced syntax and swift beginners Default Binding (Optional Binding is automatically set to null) Add ?, Nil can be bound by default. Var window: UIWindow? That is to say, if the value of window is not assigned, the value of window is nil. This is different from the principle of automatic nil setup in the ARC mode in Objective-C. NilType exists in Swift, and its inverse operation

Install nginx in windows for beginners and windowsng.pdf for beginners

Install nginx in windows for beginners and windowsng.pdf for beginners Windows Installation nginx,: http://nginx.org/download/ When downloading, download the. zip extension package because the. zip package has the nginx.exe Startup File. After the download, put it in a directory on your local disk, enter the directory in the cmd command box, and enter start nginx You can start the nginx service. The page fo

Linux beginners: (1) Linux overview and linux beginners Overview

Linux beginners: (1) Linux overview and linux beginners Overview Blog Park (FOREVER_ENJOY): http://www.cnblogs.com/zyx1314/ This article is copyrighted by the author! Indicate the connection between the author and the original article Structure of Linux Directories In Linux, all files in the system are organized and managed in a directory. In Linux, all the files in the system are classified and h

Html/Css (article 2 for beginners) and css beginners

Html/Css (article 2 for beginners) and css beginners 1. In actual work, a team is working on a project, not a person. Multi-person collaboration means that each team has its ownNaming Conventions.1. css selection character naming, standard.2. There are naming conventions. Ii. css selection operator: Specifies the object (range) to which the css style applies)1. Tag selector: For html tags2. id selector: For

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