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javascript - ES6: Is it dangerous to delete elements from Set/Map during Set/Map iteration?

Safe code for new Set() may look like: let items = []; for (let item of set) if (isBad(item)) items. ... || isBadValue(val)) map.delete(key) See Question&Answers more detail:os...

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

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php - Jquery - Uncaught TypeError: Cannot use 'in' operator to search for '324' in

I'm trying to send a Get request by ajax and output json data that is returned by server in html. But, I got ... me out. Thanks in advance :) See Question&Answers more detail:os...

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

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stl - Is the C++ std::set thread-safe?

I've a question about the thread safety of std::set. As far as I know I can iterate over a set and add/ ... Is lack of thread safety the cause? See Question&Answers more detail:os...

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

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regex - Does the 'o' modifier for Perl regular expressions still provide any benefit?

It used to be considered beneficial to include the 'o' modifier at the end of Perl regular expressions. The ... // (quoted regex) operator. See Question&Answers more detail:os...

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

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asp.net - Difference between Html.RenderAction and Html.Action

Does anybody know what's the difference between Html.RenderAction and Html.Action? See Question&Answers more detail:os...

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

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python - Error when trying to overload an operator "/"

I recently start teaching myself game programming. Someone recommend me to start with Python and I got the book " ... . Where's the problem? See Question&Answers more detail:os...

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

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subset - R gotcha: logical-and operator for combining conditions is & not &&

Why doesn't subset() work with a logical and && operator combining two conditions? > subset(tt, (customer_id==177 ... - my dataset is huge) See Question&Answers more detail:os...

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

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jquery - How to make my 'click' function work with iOS

I have a set of Div's which act as buttons. These buttons have a simple jquery click() function which works ... the key to getting this working? See Question&Answers more detail:os...

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

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How to plot stacked event duration (Gantt Charts) using Python Pandas

I have a Pandas DataFrame containing the date that a stream gage started measuring flow and the date that ... a straight matplotlib solution. See Question&Answers more detail:os...

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

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if statement - dplyr if_else() vs base R ifelse()

I am fairly proficient within the Tidyverse, but have always used ifelse() instead of dplyr if_else(). I want to ... this issue in the future. See Question&Answers more detail:os...

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

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r - Interpolate NA values

I have two set of samples that are time independent. I would like to merge them and calculate the missing ... to calculate the NA values? See Question&Answers more detail:os...

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

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regex - javascript unicode emoji regular expressions

i want to replace all emoji in string with icon now i successfully replaced those {:) :D :P :3 <3 XP ... to change any emoji to those character See Question&Answers more detail:os...

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

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Extract Values between two strings in a text file using python

Lets say I have a Text file with the below content fdsjhgjhg fdshkjhk Start Good Morning Hello World End dashjkhjk ... . Excluding Start & End. See Question&Answers more detail:os...

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

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php - How to use single quote inside an echo which is using single quote

First of all, i have gone through the related questions.. haven't found any answer.. I m using this code ... echo will break the statement... See Question&Answers more detail:os...

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

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How to get iOS device MAC address programmatically

How do I get an iOS device's MAC code programmatically in my app? See Question&Answers more detail:os...

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

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r - apply a function over groups of columns

How can I use apply or a related function to create a new data frame that contains the results of the row ... data has some hundreds of columns. See Question&Answers more detail:os...

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

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365 views

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c++ - Implicit conversion from char** to const char**

Why my compiler(GCC) doesnt implicitly cast from char** to const char**? Thie following code: #include <iostream> ... char**)' [-fpermissive] See Question&Answers more detail:os...

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

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c# - Check if a record exists in the database

I am using these lines of code to check if the record exists or not. SqlCommand check_User_Name = new ... record else // Insert record See Question&Answers more detail:os...

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

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c# - How can I retrieve a list of parameters from a stored procedure in SQL Server

Using C# and System.Data.SqlClient, is there a way to retrieve a list of parameters that belong to a stored ... is a plus for me. Joshua See Question&Answers more detail:os...

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

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Can I fetch the value of a non-standard CSS property via Javascript?

I am trying to read a custom (non-standard) CSS property, set in a stylesheet (not the inline style ... -myNameSpace-foo" or something.) See Question&Answers more detail:os...

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

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python - Travel directory tree with limited recursion depth

I need to process all files in a directory tree recursively, but with a limited depth. That means for example ... be the optimal approach here? See Question&Answers more detail:os...

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

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binaryfiles - Reading writing fortran direct access unformatted files with different compilers

I have a section in a program that writes a direct-access binary file as follows: open (53, file=filename, ... properly if I mix the compilers. See Question&Answers more detail:os...

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

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swift2 - Is it possible to replicate Swifts automatic numeric value bridging to Foundation (NSNumber) for (U)Int8/16/32/64 types?

Question Is it possible to replicate Swifts numeric value bridging to Foundation:s NSNumber reference type, for e.g. ... an iPhone 5 and 5S. See Question&Answers more detail:os...

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

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115 views

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Convert all sheets to PDF with Google Apps Script

I'm trying to convert a Google spreadsheet with multiple sheets to a PDF file. The script below works, but it ... {attachments:[array_blob]}); } See Question&Answers more detail:os...

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

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214 views

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ios - Table view images never being released

I'm working on a major update to one of my applications and trying to cut down memory usage and making it ... label color, and background color. See Question&Answers more detail:os...

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

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oracle - SQL error "ORA-01722: invalid number"

A very easy one for someone, The following insert is giving me the ORA-01722: invalid number why? INSERT INTO ... Knox','0418 418 347'); See Question&Answers more detail:os...

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

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316 views

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JavaScript parseFloat in Different Cultures

I have a question about the default behavior of JavaScript's parseFloat function in different parts of the world. ... this doesn't make sense. See Question&Answers more detail:os...

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

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operators - Is there any performance difference between ++i and i++ in C#?

Is there any performance difference between using something like for(int i = 0; i < 10; i++) { ... ... practical sense. It is largely academic. See Question&Answers more detail:os...

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

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