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如何在 Swift 中将字符串编码为 Base64? - How can I encode a string to Base64 in Swift?

问题: I want to convert a string to Base64.我想将字符串转换为 Base64。 I found answers in several places, but it does not work anymore in Swift.我在几个地方找到了答案,但它在 ...

今天 11:07
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Ruby on Rails: How do I add a not null constraint to an existing column using a migration?

问题: In my Rails (3.2) app, I have a bunch of tables in my database but I forgot to add a few not null constraints.在我的 Rails (3.2) 应用程序中,我的数据库中有一堆表,但我忘记...

Android 存档库 (aar) 与标准 jar - Android Archive Library (aar) vs standard jar

问题: I've been reading some articles about the new adoption of Gradle as the standard build system for Android apps.我一直在阅读一些关于新采用 Gradle 作为 Android 应用程序的标...

How to force 'cp' to overwrite directory instead of creating another one inside?

问题: I'm trying to write a Bash script that will overwrite an existing directory.我正在尝试编写一个将覆盖现有目录的 Bash 脚本。 I have a directory foo/ and I am trying to ove...

今天 10:33
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突出显示 PHP 中两个字符串的区别 - Highlight the difference between two strings in PHP

问题: What is the easiest way to highlight the difference between two strings in PHP?在 PHP 中突出显示两个字符串之间差异的最简单方法是什么? I'm thinking along the lines of th...

区别: std::runtime_error 与 std::exception() - Difference: std::runtime_error vs std::exception()

问题: What is the difference between std::runtime_error and std::exception ? std::runtime_error和std::exception什么区别? What is the appropriate use for each?每个人的适当用途是...

今天 08:52
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为什么 C# 不支持引用的返回? - Why doesn't C# support the return of references?

问题: I have read that .NET supports return of references, but C# doesn't.我读过 .NET 支持返回引用,但 C# 不支持。 Is there a special reason?有什么特殊原因吗? Why I can't do s...

如何在 Groovy 中创建和访问全局变量? - How do I create and access the global variables in Groovy?

问题: I need to store a value in a variable in one method and then I need to use that value from that variable in another method or closure.我需要在一个方法中的变量中存储一个值...

今天 08:34
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从整数列表中,获取最接近给定值的数字 - From list of integers, get number closest to a given value

问题: Given a list of integers, I want to find which number is the closest to a number I give in input:给定一个整数列表,我想找到哪个数字最接近我在输入中给出的数字: >>> myList...

今天 08:29
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Heroku “psql: FATAL:剩余的连接槽是为非复制超级用户连接保留的”

问题: I'm developing an app on Heroku with a Postgresql backend.我正在使用 Postgresql 后端在 Heroku 上开发应用程序。 Periodically, I get this error message when trying to acce...

Eclipse 自动完成(百分号,在 Juno 中) - Eclipse Autocomplete (percent sign, in Juno)

问题: I started using Eclipse Juno a few days ago after using older versions for years.在使用旧版本多年后,几天前我开始使用 Eclipse Juno。 There's one thing that's really both...

提升状态图与Meta状态机 - Boost Statechart vs. Meta State Machine

问题: Apparently boost contains two separate libraries for state machines: Statechart and Meta State Machine (MSM). 显然,boost包含两个独立的状态机库: Statechart和Meta State ...

为什么在我的HTML中出现? [重复] - Why is  appearing in my HTML? [duplicate]

问题: This question already has answers here : 这个问题已经在这里有了答案 : How to avoid echoing character 65279 in php? 如何避免在PHP中回显字符65279? (11 answers) (11个答案...

如何在C#中将大写的名字和姓氏大写? - How do I capitalize first letter of first name and last name in C#?

问题: Is there an easy way to capitalize the first letter of a string and lower the rest of it? 有没有一种简单的方法可以大写字符串的第一个字母并降低其余的字母? Is there a bui...

今天 05:14
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Objective-C:使用多个参数调用选择器 - Objective-C: Calling selectors with multiple arguments

问题: In MyClass.m, I've defined在 MyClass.m 中,我定义了 - (void) myTest: (NSString *) withAString{ NSLog(@"hi, %@", withAString); } and the appropriate declaration in MyClass...

今天 02:55
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如何绘制正态分布? - How to plot normal distribution?

问题: 给定均值和方差,是否有一个简单的函数调用可以绘制正态分布? 解决方案: 参考:https://stackoom.com/en/question/gXNV

今天 02:40
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使用 T-SQL 查找子字符串最后一次出现的索引 - Find index of last occurrence of a sub-string using T-SQL

问题: Is there a straightforward way of finding the index of the last occurrence of a string using SQL?有没有一种直接的方法可以使用 SQL 查找最后一次出现的字符串的索引? I am u...

在Android中将对象转换为JSON - Convert object to JSON in Android

问题: 有没有一种简单的方法可以在Android中将任何对象转换为JSON? 解决方案: 参考:https://stackoom.com/en/question/NNIK

今天 01:28
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为什么 String.split 需要管道分隔符才能转义? - Why does String.split need pipe delimiter to be escaped?

问题: I am trying to parse a file that has each line with pipe delimited values.我正在尝试解析一个文件,该文件的每一行都带有管道分隔值。 It did not work correctly when I did n...

今天 01:18
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Swift:通过引用传递数组? - Swift: Pass array by reference?

问题: I want to pass my Swift Array account.chats to chatsViewController.chats by reference (so that when I add a chat to account.chats , chatsViewController.chats still points...

今天 00:11
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