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iOS - Why Does It Work When I Compare Two NSNumbers With “==”?

由 雨燕双飞 提交于 2019-12-10 01:12:01
问题 In my app, I accidentally used "==" when comparing two NSNumber objects like so: NSNumber *number1; NSNumber *number2; Later on, after these objects' int values were set, I accidentally did this: if (number1 == number2) { NSLog(@"THEY'RE EQUAL"); } And, confusingly, it worked! I could have sworn I was taught to do it this way: if (number1.intValue == number2.intValue) { NSLog(@"THEY'RE EQUAL"); } How did using "==" between the two NSNumber objects work, and why? Does that mean it's okay to

Diff and intersection reporting between two text files

由 好久不见. 提交于 2019-12-09 18:38:21
问题 Disclaimer: I am new to programming and scripting in general so please excuse the lack of technical terms So i have two text file data sets that contain names listed: First File | Second File bob | bob mark | mark larry | bruce tom | tom I would like to run a script (pref python) that outputs the intersection lines in one text file and the different lines in another text file, ex: matches.txt : bob mark tom differences.txt : bruce How would I accomplish this with Python? Or with a Unix

好程序员大数据教程分享实用的大数据之数组

由 匆匆过客 提交于 2019-12-09 18:11:20
好程序员大数据教程分享实用的大数据之数组 1.5.1 数组的定义与元素访问 数组是一个容器, 是一个用来存储指定数据类型的容器 注意事项: 数组是一个定长的容器, 一旦实例化完成, 长度不能修改 名词解释: 数组长度: 指的就是这个容器的容量, 表示这个数组中能存储多少个数据 元素: 指的就是数组中存储的数据 下标: 某一个元素在数组中的一个位置索引 遍历数组: 依次获取到数组中的每一个元素 数组的元素访问 通过下标来访问的, 数组中元素的下标是从0开始的 数组中元素的下标: [0, 数组.length - 1] 注意: 在访问数组中元素的时候, 注意下标的范围, 不要越界!!! 遍历数组: 使用循环遍历下标的方式 int [ ] array = { 1 , 2 , 3 } ; for ( int index = 0 ; index < array . length ; index ++ ) { System . out . println ( array [ index ] ) ; } 使用增强for循环 int [ ] array = { 1 , 2 , 3 } ; for ( int ele : array ) { System . out . println ( ele ) ; } 1.5.2 数组的内存分析 1.5.3 数组的常见操作 1.5.4 数组排序 选择排序

Git - compare local and remote without fetching first?

由 拟墨画扇 提交于 2019-12-09 06:02:59
问题 I've searched around and found no answer to this question. I have an app running on Heroku. From my local machine I typically implement and just: git add . git commit -m "whatever change, I know I can add and commit at the same time..." git push <the-heroku-repo> Then it goes up and the master branch in the Heroku app is updated. So far so good. Now. I want to have another machine that will automatically make a pull from the Heroku repo and update itself. So i do that with: git clone <the

comparing strings in vb

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-12-09 03:30:15
问题 Hopefully this should be an easy question. In java i think it's compareTo() . How do I compare 2 string variables to determine if they are the same? ie: If (string1 = string2 And string3 = string4) Then 'perform operation Else 'perform another operation End If 回答1: I would suggest using the String.Compare method. Using that method you can also control whether to to have it perform case-sensitive comparisons or not. Sample: Dim str1 As String = "String one" Dim str2 As String = str1 Dim str3

PHP - Comparing time

由 我是研究僧i 提交于 2019-12-09 01:24:38
问题 I'm working on a calendar/planner web app and I need to compare the start and end times of events before I store them in my DB. An event can only have a range of one day and between 8am and midnight. The start time always has to take place before the end time. The post values come from the form in the following format hh:mm:ss ( 12:14:00 ) etc.. so I can store them in my database without much hassle. Is there any way I can compare these times? Thanks a lot! 回答1: If those times are in the

jQuery show car_orig if $(this).attr(.class)==“car”

由 末鹿安然 提交于 2019-12-09 01:07:31
I have li.box , li.car which are inside a $(this) which contain modified values and then I have box_orig , car_orig containing the original lists... how can I replace $(this) 's data (html data, the li's content) with the original list, so if $(this) contains li.box then I need to replace it with box_orig 's data Edit: var list = $("ul#list"); var box_orig = list.children('.box'); var car_orig = list.children('.car'); And $(this) $('#list li').each(function () { if ($.inArray($(this).attr('class'), show) == 0) { console.log($(this)); //-> Returns li.box / car or whatever list was selected } })

Using for loop to get the Hamming distance between 2 strings

由 强颜欢笑 提交于 2019-12-08 21:28:37
问题 In this task i need to get the Hamming distance (the Hamming distance between two strings of equal length is the number of positions at which the corresponding symbols are different - from Wikipedia) between the two strings sequence1 and sequence2. First i made 2 new strings which is the 2 original strings but both with lowered case to make comparing easier. Then i resorted to using the for loop and if to compare the 2 strings. For any differences in characters in these 2 pair of string, the

How to compare two paragraphs of text?

由 丶灬走出姿态 提交于 2019-12-08 19:57:15
问题 I need to remove duplicated paragraphs in a text with many paragraphs. I use functions from the class java.security.MessageDigest to calculate each paragraph's MD5 hash value, and then add these hash value into a Set . If add() 'ed successfully, it means the latest paragraph is a duplicate one. Is there any risk of this way? Except String.equals() , is there any other way to do it? 回答1: Before hashing you could normalize the paragraphs e.g. Removing punctuation, conversion to lower case and

Comparing first element of the consecutive lists of tuples in Python

由 隐身守侯 提交于 2019-12-08 19:28:45
问题 I have a list of tuples, each containing two elements. The first element of few sublists is common. I want to compare the first element of these sublists and append the second element in one lists. Here is my list: myList=[(1,2),(1,3),(1,4),(1,5),(2,6),(2,7),(2,8),(3,9),(3,10)] I would like to make a list of lists out of it which looks something like this:` NewList=[(2,3,4,5),(6,7,8),(9,10)] I hope if there is any efficient way. 回答1: You can use an OrderedDict to group the elements by the
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