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What does the question mark and the colon (?: ternary operator) mean in objective-c?

What does this line of code mean? label.frame = (inPseudoEditMode) ? kLabelIndentedRect : kLabelRect; The ? and : confuse me. Question&Answers:os...

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

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javascript - Arrow function without curly braces

I'm new to both ES6 and React and I keep seeing arrow functions. Why is it that some arrow functions use curly ... { e.preventDefault(); dispatch('logout'); }; Question&Answers:os...

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

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php - Only variables should be passed by reference

// Other variables $MAX_FILENAME_LENGTH = 260; $file_name = $_FILES[$upload_name]['name']; //echo "testing-".$file_name ... Any ideas? After 2 days still stuck. Question&Answers:os...

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

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python - How to read a file in reverse order?

How to read a file in reverse order using python? I want to read a file from last line to first line. Question&Answers:os...

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

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r - How to get summary statistics by group

I'm trying to get multiple summary statistics in R/S-PLUS grouped by categorical column in one shot. I found couple of ... ...etc in one call, is that doable? Question&Answers:os...

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

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javascript - AJAX cross domain call

I know about AJAX cross-domain policy. So I can't just call "http://www.google.com" over a ajax HTTP ... from a foreign domain? iFrames follow the same policy? Question&Answers:os...

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

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javascript - Submit two forms with one button

I have HTML two forms, one that submits data upon entry to a database using PHP, the other directs the user ... button for two forms? (Javascript is welcome) Question&Answers:os...

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

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Populating cascading dropdown lists in JSP/Servlet

Suppose I am having three dropdownlist controls named dd1, dd2 and dd3. The value of each dropdownlist comes from ... how do I call servlet for this problem? Question&Answers:os...

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

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java - How to use Key Bindings instead of Key Listeners

I'm using KeyListeners in my code (game or otherwise) as the way for my on-screen objects to react to user key ... Why does this happen and how do I fix this? Question&Answers:os...

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

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Difference between * and + regex

Can anybody tell me the difference between the * and + operators in the example below: [<>]+ [<>]* Question&Answers:os...

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

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python - Error: pandas hashtable keyerror

I have successfully read a csv file using pandas. When I am trying to print the a particular column from the data ... review' ** Can someone help me in this ? Question&Answers:os...

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

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Why does DEBUG=False setting make my django Static Files Access fail?

Am building an app using Django as my workhorse. All has been well so far - specified db settings, ... , concerning static files and the DEBUG setting? Question&Answers:os...

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

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c# - How to call Stored Procedure in Entity Framework 6 (Code-First)?

I am very new to Entity Framework 6 and I want to implement stored procedures in my project. I have a ... the stored procedure and pass parameters into it? Question&Answers:os...

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

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Remove duplicates from a List<T> in C#

Anyone have a quick method for de-duplicating a generic List in C#? Question&Answers:os...

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

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html - Using relative URL in CSS file, what location is it relative to?

When defining something like a background image URL in a CSS file, when using a relative URL, where is it ... index.html /about/extra/other.html /index.html Question&Answers:os...

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

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javascript - Get array of object's keys

I would like to get the keys of a JavaScript object as an array, either in jQuery or pure JavaScript. Is there a less ... (var key in foo) { keys.push(key); } Question&Answers:os...

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

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c# - Quickest way to convert a base 10 number to any base in .NET?

I have and old(ish) C# method I wrote that takes a number and converts it to any base: string ConvertToBase(int ... good and efficient way of doing this in C#? Question&Answers:os...

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

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python - How to merge dictionaries of dictionaries?

I need to merge multiple dictionaries, here's what I have for instance: dict1 = {1:{"a":{A}}, 2:{"b":{B ... I'm not sure how I could do that easily with Python. Question&Answers:os...

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

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c# - JSON.net: how to deserialize without using the default constructor?

I have a class that has a default constructor and also an overloaded constructor that takes in a set of parameters. ... , string>(); else Details = details; } Question&Answers:os...

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

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html - Can I set an opacity only to the background image of a div?

Let's say I have <div class="myDiv">Hi there</div> I want to put a background-image and give it ... I get low-opacity background image with full opacity text? Question&Answers:os...

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

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python - What is the syntax rule for having trailing commas in tuple definitions?

In the case of a single element tuple, the trailing comma is required. a = ('foo',) What about a tuple with multiple ... , 'foo2') b = ('foo1', 'foo2',) Question&Answers:os...

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

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css - Border Gradient with Border Radius

I have the following CSS:- a.btn.white-grad { background: $lgrey; color: #313149 !important; border: 1px ... achieve the desired 5px border radius at all? Question&Answers:os...

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

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dependency injection - Why do I need an IoC container as opposed to straightforward DI code?

Closed. This question is opinion-based. It is not currently accepting answers. Question&Answers:os...

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

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How to find object in array by property in javascript?

Exist an array with a lot of objects. Required to find an object or objects in this array by property. Input obj: var Obj ... "length": 3, "style": "error"} ]; Question&Answers:os...

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

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Python list of dictionaries search

Assume I have this: [ {"name": "Tom", "age": 10}, {"name": "Mark", "age": 5}, {"name": "Pam", "age" ... dictionary: {name: "Pam", age: 7} How to achieve this ? Question&Answers:os...

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python - Sorting arrays in NumPy by column

How can I sort an array in NumPy by the nth column? For example, a = array([[9, 2, 3], [4, 5, 6], [7, 0, 5]]) I'd like ... ([[7, 0, 5], [9, 2, 3], [4, 5, 6]]) Question&Answers:os...

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

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git - How to do a GitHub pull request

How do I create and/or send a pull request to another repository hosted on GitHub? Question&Answers:os...

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

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SQL - HAVING vs. WHERE

I have the following two tables: 1. Lecturers (LectID, Fname, Lname, degree). 2. Lecturers_Specialization (LectID, ... BY LectID); What is the reason? Thanks. Question&Answers:os...

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

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