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How do I replace a character at a particular index in JavaScript?

I have a string, let's say Hello world and I need to replace the char at index 3. How can I replace a char by specifying a index? ...
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Why is argc not a constant?

...ough getopt's prototype suggests it won't modify argv[] but may modify the strings pointed to, the Linux man page indicates that getopt permutes its arguments, and it appears they know they're being naughty. The man page at the Open Group does not mention this permutation.) Putting const on argc a...
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C++ convert hex string to signed integer

I want to convert a hex string to a 32 bit signed integer in C++. 9 Answers 9 ...
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Django template tag to truncate text

...mplate filter, that add "..." to the end of (last word of) the (truncated) string as well: from django import template register = template.Library() @register.filter("truncate_chars") def truncate_chars(value, max_length): if len(value) > max_length: truncd_val = value[:max_length] ...
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What is the difference between sigaction and signal?

... And that's it. Anything else is not guaranteed to be portable. That's so stringent that most people ignore those rules — but the resulting code is dodgy. – Jonathan Leffler Oct 27 '16 at 16:14 ...
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ASP.NET MVC 5 - Identity. How to get current ApplicationUser

...od inside a LINQ query. Correct code: using Microsoft.AspNet.Identity; string currentUserId = User.Identity.GetUserId(); ApplicationUser currentUser = db.Users.FirstOrDefault(x => x.Id == currentUserId); share ...
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Can I concatenate multiple MySQL rows into one field?

... If you want to sort hobbies in the resulting imploded string use: SELECT person_id, GROUP_CONCAT(hobbies ORDER BY hobbies ASC SEPARATOR ', ') FROM peoples_hobbies GROUP BY person_id – Jan Mar 8 '17 at 15:38 ...
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warning: implicit declaration of function

...t;stdio.h> #include <stdlib.h> #include <xc.h> #include <string.h> #include <math.h> #include <libpic30.h> // http://microchip.wikidot.com/faq:74 #include <stdint.h> #include <stdbool.h> #include "GenericTypeDefs.h" // This has the 'BYTE' type defi...
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Stripping everything but alphanumeric chars from a string in Python

What is the best way to strip all non alphanumeric characters from a string, using Python? 11 Answers ...
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Create JSON-object the correct way

...work, I find the following approach more natural: $obj = (object) [ 'aString' => 'some string', 'anArray' => [ 1, 2, 3 ] ]; echo json_encode($obj); share | improve this answer ...