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How to append to a file in Node?
...eam.
Example with appendFile:
console.log(new Date().toISOString());
[...Array(10000)].forEach( function (item,index) {
fs.appendFile("append.txt", index+ "\n", function (err) {
if (err) console.log(err);
});
});
console.log(new Date().toISOString());
Up to 8000 on my computer, y...
Getting distance between two points based on latitude/longitude
...versine_vector([lyon, lyon], [paris, new_york], Unit.KILOMETERS)
>> array([ 392.21725956, 6163.43638211])
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Switch on Enum in Java [duplicate]
...efault" to worry about. Also, I've seen code that puts enum constants into arrays and then indexes into the arrays - this opens the possibility of array index out of bounds exceptions - just use the enum! Java enums are very, very powerful. Learn all that you can about them to use them effectively.
...
How to check whether a given string is valid JSON in Java
... // edited, to include @Arthur's comment
// e.g. in case JSONArray is valid as well...
try {
new JSONArray(test);
} catch (JSONException ex1) {
return false;
}
}
return true;
}
This code uses org.json JSON API implementation tha...
Why are unnamed namespaces used and what are their benefits?
...on't understand anonymous namespaces :)
namespace {
const int SIZE_OF_ARRAY_X;
const int SIZE_OF_ARRAY_Y;
These don't need to be in an anonymous namespace, since const object already have static linkage and therefore can't possibly conflict with identifiers of the same name in another tra...
Principles for Modeling CouchDB Documents
...before "b"). You can also output complex keys from your map/reduce as JSON arrays: ["a", "b", "c"]. Doing that would allow you to include a "tree" of sorts built out of array keys. Using your example above, we can output the post_id, then the type of thing we're referencing, then its ID (if needed)....
RGB to hex and hex to RGB
...t seems to be even faster
function hexToRgbNew(hex) {
var arrBuff = new ArrayBuffer(4);
var vw = new DataView(arrBuff);
vw.setUint32(0,parseInt(hex, 16),false);
var arrByte = new Uint8Array(arrBuff);
return arrByte[1] + "," + arrByte[2] + "," + arrByte[3];
}
Edit: 8/11/2017
The new app...
Why does C++11 not support designated initializer lists as C99? [closed]
...der of the data members
int arr[3] = { [1] = 5 } is invalid in C++ because array designated initialization is not supported
struct B b = {.a.x = 0} is invalid in C++ because designators cannot be nested
struct A c = {.x = 1, 2} is invalid in C++ because either all or none of the data members must be...
Dynamically updating plot in matplotlib
...
self._t0 = time.time() # initialize time
self.xdata = np.array([self._t0]) # time x-axis
self.ydata = np.array([0.0]) # fake data y-axis
# create a graph frame
self.mygraph = self.add_frame(jk.Graph(name="test", size=(500, 500), pos=(50, 50), fmt="go-", xn...
How to get current time in milliseconds in PHP?
...returns the microseconds part as an integer.
var_dump(gettimeofday());
/*
array(4) {
["sec"]=>
int(1283846202)
["usec"]=>
int(891199)
["minuteswest"]=>
int(-60)
["dsttime"]=>
int(1)
}
*/
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