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How to properly create composite primary keys - MYSQL
...is a gross oversimplification of an intense setup I am working with. table_1 and table_2 both have auto-increment surrogate primary keys as the ID. info is a table that contains information about both table_1 and table_2 .
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How to extend an existing JavaScript array with another array, without creating a new array
...ethod can take multiple arguments. You can use the spread operator to pass all the elements of the second array as arguments to .push:
>>> a.push(...b)
If your browser does not support ECMAScript 6, you can use .apply instead:
>>> a.push.apply(a, b)
Or perhaps, if you think i...
Should I instantiate instance variables on declaration or in the constructor?
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There is no difference - the instance variable initialization is actually put in the constructor(s) by the compiler.
The first variant is more readable.
You can't have exception handling with the first variant.
There is additionally the initialization block, which is as well put in the constru...
Why can I use a function before it's defined in JavaScript?
...rn true; };
it would stop working.
The function declaration is syntactically quite separate from the function expression, even though they look almost identical and can be ambiguous in some cases.
This is documented in the ECMAScript standard, section 10.1.3. Unfortunately ECMA-262 is not a very...
jQuery date/time picker [closed]
...ittle over then a little under) and I end up typing it. A keyboard is normally the easiest way to enter a precise numerical value. If you want a visual input method, a clock is the normal one for time, not a slider. Harder to implement, but might actually be useful (as long as keyboard input is a...
How to compile without warnings being treated as errors?
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You can make all warnings being treated as such using -Wno-error. You can make specific warnings being treated as such by using -Wno-error=<warning name> where <warning name> is the name of the warning you don't want treated a...
Creating dataframe from a dictionary where entries have different lengths
... holds a numpy array. However, the length of the array is not the same for all of them.
9 Answers
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C++ code file extension? .cc vs .cpp [closed]
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When one considers that the compiler is not typically the only tool involved -- almost always, there is "make" or a similar utility that WILL care which extensions you use, for build rules matching -- then this answer really does not address the core concerns of the questio...
Quora如何在快速开发中保持高品质代码 - 项目管理 - 清泛网 - 专注C/C++及内核技术
...模块/目录等级的代码“ownership”上添加标签，例如：
__reviewer__ = 'vanessa, kornel'
如果提交新变更，系统就自动会分析文件（或其上层目录），将新审查者的名字添加到提交数据中。我们还有额外的规则将代码审核派发给合适的...
What is `mt=8` in iTunes links for the App Store?
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@FabianFernandez See here. Its all about affiliation -- stackoverflow.com/questions/17437785/…
– Anindya Sengupta
Aug 8 '14 at 15:04
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