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Detecting when the 'back' button is pressed on a navbar
...navigationItem.leftBarButtonItem = backButton
}
// Then handle the button selection
func goBack() {
// Here we just remove the back button, you could also disabled it or better yet show an activityIndicator
self.navigationItem.leftBarButtonItem = nil
someData.saveInBackground { (success...
Given a number, find the next higher number which has the exact same set of digits as the original n
...g order, there's no bigger number to be made without adding digits.)
B.1. Select the last digit of the first sequence:
3472(2) 641
B.2. Find the smallest digit in the second sequence that is larger than it:
3472(2) 6(4)1
B.3. Swap them:
3472(2) 6(4)1
->
3472(4) 6(2)1
->
34724 621
C. ...
Test for existence of nested JavaScript object key
...th Claudiu's modification which is also significantly more performant than selected answer. See jsperf here jsperf.com/check-if-deep-property-exists-with-willnotthrow
– netpoetica
Nov 27 '14 at 5:35
...
How to Update Multiple Array Elements in mongodb
...n the search result to just those that match the conditions for the update selection:
db.collection.aggregate([
{ "$match": { "events.handled": 1 } },
{ "$project": {
"events": {
"$setDifference": [
{ "$map": {
"input": "$events",
...
sed: print only matching group
... -d " " -f 6-7
Will result in output of:
2 3.4
-d sets the delimiter
-f selects the range of 'fields' to output, in this case, it's the 6th through 7th chunks of the original string. You can also specify the range as a list, such as 6,7.
...
Force browser to download image files on click
...
Thanks should've been the selected answer since the question asked how to do it in JAVASCRIPT.
– codehelp4
Sep 23 '18 at 2:25
...
Can you autoplay HTML5 videos on the iPad?
...mmyVideo.get(0) instead of brackets, so jQuery can gracefully fail if your selection is empty.
– Micros
Dec 3 '14 at 14:46
...
Scope of sessionStorage and localStorage
...se called webappsstore.sqlite in my Firefox profile directory, using query SELECT scope FROM webappsstore2;. The result is the reverse of the domain, followed by the non-reversed protocol, and sufficed with the port, eg: gro.allizom.snodda.secivres.:https:443. As you can see, there's no mention of a...
How to vertically center content with variable height within a div?
...
Using the child selector, I've taken Fadi's incredible answer above and boiled it down to just one CSS rule that I can apply. Now all I have to do is add the contentCentered class name to elements I want to center:
.contentCentered {
...
count the frequency that a value occurs in a dataframe column
...iple columns in a df
[my_series[c].value_counts() for c in list(my_series.select_dtypes(include=['O']).columns)]
https://stackoverflow.com/a/28192263/786326
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