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lexer - When parsing Javascript, what determines the meaning of a slash?

Javascript has a tricky grammar to parse. Forward-slashes can mean a number of different things: division operator, ... that has the answer? See Question&Answers more detail:os...

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Regex for parsing directory and filename

I'm trying to write a regex that will parse out the directory and filename of a fully qualified path ... succinctly describe the root problem. See Question&Answers more detail:os...

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c# - Is it better to declare a variable inside or outside a loop?

Is better do: variable1Type foo; variable2Type baa; foreach(var val in list) { foo = new Foo( ... ); foo ... I really want know which is better. See Question&Answers more detail:os...

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performance - How expensive are Python dictionaries to handle?

As the title states, how expensive are Python dictionaries to handle? Creation, insertion, updating, deletion, all ... tuples or normal lists. See Question&Answers more detail:os...

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java - How to make generated classes contain Javadoc from XML Schema documentation

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c# - Error: Cannot obtain Metadata from WCF service

I have a successfully running WCF service that I can call using javascript. However I want to invoke it using ... can invoke with the client? See Question&Answers more detail:os...

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c++ - What does `auto && e` do in range-based for-loops?

Assuming my current rule when programming with range-based loops says Use for(auto const &e :...) or for(auto ... needed do not use references. See Question&Answers more detail:os...

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Django Programming error column does not exist even after running migrations

I run python manage.py makemigrations and I get: No changes detected Then, python manage.py migrate and I get: No ... How can I debug this??? See Question&Answers more detail:os...

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java - Android: what to choose for requestcode values?

Methods like ActivityCompat.requestPermissions require that I pass them a requestcode that I can later test in a ... (ZygoteInit.java:616)? See Question&Answers more detail:os...

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c# - using statement FileStream and / or StreamReader - Visual Studio 2012 Warnings

The new Visual Studio 2012 is complaining about a common code combination I have always used. I know it ... combination directly. Thank you! See Question&Answers more detail:os...

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ios - CFBundleVersion must be higher than previous version

I'm submitting an update to one of my apps. I've done this dozens of times with the many different apps I've ... is wrong. What am I missing? See Question&Answers more detail:os...

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javascript - How to compare two HTML elements

How can we compare two HTML elements whether they are identical or not ? I tried this thing but ... completely working implementation strategy. See Question&Answers more detail:os...

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python - Line plot with arrows in matplotlib

I have a line graph that I want to plot using arrows instead of lines. That is, the line between successive pairs of ... a nicer way to do it? See Question&Answers more detail:os...

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jquery - start javascript code with $(function, etc

I am studying Backbone and the todo example apps from http://todomvc.com/ I have noticed there are 3 severals ... files? Thanks for your advice. See Question&Answers more detail:os...

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java - What's the purpose behind wildcards and how are they different from generics?

I'd never heard about wildcars until a few days ago and after reading my teacher's Java book, I'm still ... later? How are they so different? See Question&Answers more detail:os...

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javascript - How can I copy to clipboard in HTML5 without using flash?

I want to use a copy-to-clipboard function in HTML5, but without using flash. Is it possible? How? I tried to ... range.execCommand('Copy'); } } See Question&Answers more detail:os...

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c++ - What does `auto && e` do in range-based for-loops?

Assuming my current rule when programming with range-based loops says Use for(auto const &e :...) or for(auto ... needed do not use references. See Question&Answers more detail:os...

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python - Convert NumPy array to 0 or 1 based on threshold

I have an array below: a=np.array([0.1, 0.2, 0.3, 0.7, 0.8, 0.9]) What I want is to convert this vector to ... , 0, 1, 1, 1] How can I do this? See Question&Answers more detail:os...

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python - How to sort multidimensional array by column?

Is there a way to use the sort() method or any other method to sort a list by column? Lets say I have ... (list_not_sorted, key=lambda x:x[2]) See Question&Answers more detail:os...

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c# - How do I compute the non-client window size in WPF?

WPF has the SystemParameters class that exposes a great number of system metrics. On my computer I have ... values by using SystemParameters? See Question&Answers more detail:os...

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java - Use method reference with parameter

I just started learning Java streams and faced a problem. Please take a look at a the following example. This is ... . Is it the only solution? See Question&Answers more detail:os...

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python - Escaping strings for use in XML

I'm using Python's xml.dom.minidom to create an XML document. (Logical structure -> XML string, not the other way ... able to mess up the XML? See Question&Answers more detail:os...

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Try Catch cannot work with require_once in PHP?

I can't do something like this ? try { require_once( '/includes/functions.php' ); } catch(Exception $e) { ... is echoed, server returns 500. See Question&Answers more detail:os...

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javascript - How do I access an iframe from CasperJS?

I have a webpage with an iframe. I'd like to access the contents of the iframe using CasperJS. In particular, ... and phantomjs version 1.6.0. See Question&Answers more detail:os...

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c - Why is FLT_MIN equal to zero?

limits.h specifies limits for non-floating point math types, e.g. INT_MIN and INT_MAX. These values are the ... a really large negative number? See Question&Answers more detail:os...

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Difference between file, file_get_contents, and fopen in PHP

I am new to PHP, and I am not quite sure: what is the difference between the file(), file_get_contents(), and ... I use one over the other? See Question&Answers more detail:os...

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How to get element by Index in Spark RDD (Java)

I know the method rdd.firstwfirst() which gives me the first element in an RDD. Also there is the method rdd. ... an element by index? Thanks.e See Question&Answers more detail:os...

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php - Convert to date format dd/mm/yyyy

I have the following date: 2010-04-19 18:31:27. I would like to convert this date to the dd/mm/yyyy format. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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