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How to make a phone call programmatically?
...anything.
Don't forget to add the relevant permission to your manifest:
<uses-permission android:name="android.permission.CALL_PHONE" />
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Double vs single quotes
...l work because passed within single-quotes:
"123 ABC".match('\d')
=> #<MatchData "1">
This regex pattern will fail because passed within double-quotes (you would have to double-escape it to get it to work):
"123 ABC".match("\d")
=> nil
...
Setting action for back button in navigation controller
I'm trying to overwrite the default action of the back button in a navigation controller. I've provided a target an action on the custom button. The odd thing is when assigning it though the backbutton attribute it doesn't pay attention to them and it just pops the current view and goes back to the...
Value of i for (i == -i && i != 0) to return true in Java
...lues is not symmetric, so negation of the maximum negative int or long results in that same maximum negative number."
– chesterbr
Jul 26 '13 at 4:11
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Convert a list to a data frame
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Update July 2020:
The default for the parameter stringsAsFactors is now default.stringsAsFactors() which in turn yields FALSE as its default.
Assuming your list of lists is called l:
df <- data.frame(matrix(unlist(l), nrow=length(l), byrow=T))
The...
git - Server host key not cached
...host '127.0.0.1 (127.0.0.1)' can't be established.
RSA key fingerprint is <FINGERPRINT>.
Are you sure you want to continue connecting (yes/no)?
If you trust the remote host (i.e. type yes), SSH will add its key to the list of known hosts.
After that, you should be able to do your git push o...
Disable hover effects on mobile browsers
...nd mouseenter.
Remove hover effects on mouseleave, touchmove and click.
Alternatively, you can edit your page that there is no content change.
Background
In order to simulate a mouse, browsers such as Webkit mobile fire the following events if a user touches and releases a finger on touch screen...
Python: Checking if a 'Dictionary' is empty doesn't seem to work
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agreed, I feel like using the booleans and not <dict> is not that clear too
– cryanbhu
May 28 '19 at 2:07
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How to append something to an array?
...nitialize array
var arr = ["Hi", "Hello", "Bonjour", "Hola"];
// append multiple values to the array
arr.push("Salut", "Hey");
// display all values
for (var i = 0; i < arr.length; i++) {
console.log(arr[i]);
}
Update
If you want to add the items of one array to another array, you can ...
Determine what attributes were changed in Rails after_save callback?
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Rails 5.1+
Use saved_change_to_published?:
class SomeModel < ActiveRecord::Base
after_update :send_notification_after_change
def send_notification_after_change
Notification.send(…) if (saved_change_to_published? && self.published == true)
end
end
Or if you p...