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Simple explanation of MapReduce?
...want all without you knowing how it loops over all the records.
There are indexes and keys and joins and views and a lot of stuffs a single database could hold, so by shielding you against how the data is actually stored, your code are made easier to write and maintain.
Same goes for parallel prog...
Using HTML5/Canvas/JavaScript to take in-browser screenshots
... errors.push(ex)
}
// for electron js
if (navigator.userAgent.indexOf('Electron') >= 0) {
try {
stream = await getUserMedia({
audio: false,
video: {
mandatory: {
chromeMediaSource: 'deskto...
Why use pointers? [closed]
... any element in the array like this
printf("Second char is: %c", a[1]);
Index 1 since the array starts with element 0. :-)
Or you could equally do this
printf("Second char is: %c", *(a+1));
The pointer operator (the *) is needed since we are telling printf that we want to print a character. W...
Natural Sort Order in C#
...ing:
Func<string, string> expand = (s) => { int o; while ((o = s.IndexOf('\\')) != -1) { int p = o + 1;
int z = 1; while (s[p] == '0') { z++; p++; } int c = Int32.Parse(s.Substring(p, z));
s = s.Substring(0, o) + new string(s[o - 1], c) + s.Substring(p + z); } return s; };
string e...
Coding Practices which enable the compiler/optimizer to make a faster program
...e of loops
If a calculation or variable value does not depend on the loop index, move it outside (before) the loop.
I/O in blocks
Read and write data in large chunks (blocks). The bigger the better. For example, reading one octect at a time is less efficient than reading 1024 octets with one re...
Switch statement fallthrough in C#?
...e takes a value, computes an offset from it (whether by looking up a table indexed by a perfect hash of the value, or by actual arithmetic on the value*). It's worth noting at this point that today, C# compilation will sometimes turn switch into the equivalent if-else, and sometimes use a hash-based...
Get Character value from KeyCode in JavaScript… then trim
...
Readable key names indexed by key code
There are relatively few key codes so I simply listed all the corresponding values in a static array so I could simply convert the number 65 into A using keyboardMap[65]
Not all key codes map to a printa...
Which cryptographic hash function should I choose?
...asswords, or for challenge-response auth, or for access tokens, or just to index a bunch of strings/files. Performance, on the other hand, is a concern for the OP...
– Seva Alekseyev
May 23 '19 at 17:33
...
How does LMAX's disruptor pattern work?
...r are examined in order from the one respective to the consumerCallId (the index is determined in the same manner as for producers), to the one respective to the recent producerCallId.
They are examined in a loop by comparing the flag value written in the flag array, against a flag value generated ...
Applying a function to every row of a table using dplyr?
...
Can you refer to Sepal.Length and Petal.Length by their index number in some way? If you have lots of variables did would be handy. Like ... Max.len = max( [c(1,3)] ) ?
– Rasmus Larsen
Jun 19 '14 at 7:43
...