大约有 45,000 项符合查询结果（耗时：0.0551秒） [XML]
Extracting numbers from vectors of strings
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gregexpr. I hadn't tried regexpr until just now. HUGE difference. Using regexpr puts it between Andrew's and Arun's solutions (second fastest) on a 1e6 set. Perhaps also interesting, using sub in Andrew's solution does not improve the speed.
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Delete a key from a MongoDB document using Mongoose
..._id: user._id}, {$unset: {field: 1 }}, callback);
And since version 2.4, if you have an instance of a model already you can do:
doc.field = undefined;
doc.save(callback);
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Passing functions with arguments to another function in Python?
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What if perform and action1, action2 on different files? @S.Lott
– alper
Sep 2 '19 at 18:47
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ASP.NET MVC - TempData - Good or bad practice
... have implications for you if:
You don't use sessions on your site right now
You have a system that needs to scale to high throughput, i.e. you'd prefer to avoid session state altogether
You don't want to use cookies (I don't know how well MVC supports cookieless sessions right now)
If your site...
What is Weak Head Normal Form?
...a constructor, stop.
To avoid building these large expressions when we know all the subexpressions will have to be evaluated, we want to force the inner parts to be evaluated ahead of time.
seq
seq is a special function that is used to force expressions to be evaluated. Its semantics are that s...
Grab a segment of an array in Java without creating a new array on heap
...have to create a new byte array in the heap memory just to do that. Right now I have the following code:
15 Answers
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demystify Flask app.secret_key
... the browser:
( 1 ) First a SECRET_KEY is established. It should only be known to the application and should be kept relatively constant during the application's life cycle, including through application restarts.
# choose a salt, a secret string of bytes
>>> SECRET_KEY = 'my super secret...
JavaScript chop/slice/trim off last character in string
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forgive me if I'm wrong but don't you need to assign the value of str.substring to str again? Like str = str.substring(0, str.length -1);
– Doug Molineux
Jul 15 '11 at 16:10
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C# 4 default parameter values: How to assign a default DateTime/object value? [duplicate]
If DateTime is an object and default C# parameters can only be assigned compile-time constants, how do you provide default values for objects like DateTime?
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How to use the C socket API in C++ on z/OS
... standard in other sockets implementations, it appears to be something specific to z/OS.
Take a look at this page:
Compiling and Linking a z/VM C Sockets Program
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