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Get a random item from a JavaScript array [duplicate]
...ash :)):
var randomArray = [
'#cc0000','#00cc00', '#0000cc'
];
// use _.sample
var randomElement = _.sample(randomArray);
// manually use _.random
var randomElement = randomArray[_.random(randomArray.length-1)];
Or to shuffle an entire array:
// use underscore's shuffle function
var firstRa...
HTML5 Email Validation
... matches the following regular expression:
/^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$/
Use the required attribute and a pattern attribute to require the value to match the regex pattern.
<input
type="text"
pattern="/^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~...
How to check if a file exists in Go?
...doesn't exist, equivalent to Python's if not os.path.exists(filename):
if _, err := os.Stat("/path/to/whatever"); os.IsNotExist(err) {
// path/to/whatever does not exist
}
To check if a file exists, equivalent to Python's if os.path.exists(filename):
Edited: per recent comments
if _, err := o...
Django templates: verbose version of a choice
...
In Django templates you can use the "get_FOO_display()" method, that will return the readable alias for the field, where 'FOO' is the name of the field.
Note: in case the standard FormPreview templates are not using it, then you can always provide your own templat...
How can I get current location from user in iOS
...be kept calling. Happy Coding Guys!! Cheers!!
– Apple_iOS0304
Mar 13 '13 at 4:07
5
You are the ty...
What is “:-!!” in C code?
...ld.
The macro is somewhat misnamed; it should be something more like BUILD_BUG_OR_ZERO, rather than ...ON_ZERO. (There have been occasional discussions about whether this is a confusing name.)
You should read the expression like this:
sizeof(struct { int: -!!(e); }))
(e): Compute expression e....
How do you produce a .d.ts “typings” definition file from an existing JavaScript library?
... change all the extensions to .ts.
Get-ChildItem | foreach { Rename-Item $_ $_.Name.Replace(".js", ".ts") }
Second, use the TypeScript compiler to generate definition files. There will be a bunch of compiler errors, but we can ignore those.
Get-ChildItem | foreach { tsc $_.Name }
Finally, com...
How do I know if a generator is empty from the start?
...quence in memory. So there's no backward traversal.
You could write a has_next function or maybe even slap it on to a generator as a method with a fancy decorator if you wanted to.
share
|
improve...
window.close and self.close do not close the window in Chrome
...ion" exploit. So code like this used to work in general:
open(location, '_self').close();
This is buggy behavior, IMO, and is now (as of roughly April 2015) mostly blocked. It will still work from injected code only if the tab is freshly opened and has no pages in the browsing history. So it'...
Positioning MKMapView to show multiple annotations at once
...(IBAction)zoomOut:(id)sender {
CLLocationCoordinate2D southWest = _newLocation.coordinate;
CLLocationCoordinate2D northEast = southWest;
southWest.latitude = MIN(southWest.latitude, _annotation.coordinate.latitude);
southWest.longitude = MIN(southWest.longitude, _an...