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What are the differences between a multidimensional array and an array of arrays in C#?
...sembly with an IL disassembler you will see that the storage and retrieval from jagged (or single dimensional) arrays are simple IL instructions while the same operations for multidimensional arrays are method invocations which are always slower.
Consider the following methods:
static void SetElem...
Convert a Unix timestamp to time in JavaScript
..., not seconds.
var date = new Date(unix_timestamp * 1000);
// Hours part from the timestamp
var hours = date.getHours();
// Minutes part from the timestamp
var minutes = "0" + date.getMinutes();
// Seconds part from the timestamp
var seconds = "0" + date.getSeconds();
// Will display time ...
href=“tel:” and mobile numbers
... but there is no reason you would not add the simple "+" to make them work from everywhere! (tel:+1847... would work for calling a US number from anywhere in the world).
– Ecuador
May 4 '17 at 13:42
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Concept behind these four lines of tricky C code
...e question's conversion to pure C was done by the community, without input from the original asker.
Formally speaking, it's impossible to reason about this program because it's ill-formed (i.e. it's not legal C++). It violates C++11[basic.start.main]p3:
The function main shall not be used wit...
Why does changing 0.1f to 0 slow down performance by 10x?
...amplitude (not audible) DC or or square wave signal to jitter numbers away from denormality.
– Russell Borogove
Feb 17 '12 at 0:12
16
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CSRF protection with CORS Origin header vs. CSRF token
...h would enable an attacker to send a request with a spoofed referer header from the victim's machine in order to execute an attack.
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HTML5 Pre-resize images before uploading
...rough most of the process. For reference here's the assembled source code from the blog post:
// from an input element
var filesToUpload = input.files;
var file = filesToUpload[0];
var img = document.createElement("img");
var reader = new FileReader();
reader.onload = function(e) {img.src = e.t...
ExecJS::RuntimeError on Windows trying to follow rubytutorial
... into Windows is in fact supported...
ExecJS lets you run JavaScript code from Ruby. It automatically picks the best runtime available to evaluate your JavaScript program, then returns the result to you as a Ruby object.
ExecJS supports these runtimes:
therubyracer - Google V8 embedded within Ruby...
sed or awk: delete n lines following a pattern
... A clever (albeit GNU-Sed-specific) solution, but few people will benefit from it, unless you add an explanation. pattern_number.txt is a 2-column file containing the pattern to match in the 1st column, and in the 2nd the number of lines to skip. The first sed command transforms the file into a se...
MongoDB: Combine data from multiple collections into one..how?
How can I (in MongoDB) combine data from multiple collections into one collection?
11 Answers
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