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How to explain callbacks in plain english? How are they different from calling one function from ano
...ll-back-function as parameters taking the result created with the variable by the original function and pass it in the call-back-function for further processing. example: func1(a, callback_func){ v = a + 1} and there is predefined call back function: callback_func(v){return v+1;} this will increase ...
How can I decompress a gzip stream with zlib?
...TS);
If you don't do this, zlib will complain about a bad stream format. By default, zlib creates streams with a zlib header, and on inflate does not recognise the different gzip header unless you tell it so. Although this is documented starting in version 1.2.1 of the zlib.h header file, it is no...
Change key pair for ec2 instance
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This is so smelly… First of all, see the answer by Eric Hammond below. Second: answer by Pat Mcb. They perform actually the same thing but without wasting 1h of your time on doing the hilarious workaround. PS. See also stackoverflow.com/a/24143976/547223
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Preventing Laravel adding multiple records to a pivot table
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You can check the presence of an existing record by writing a very simple condition like this one :
if (! $cart->items->contains($newItem->id)) {
$cart->items()->save($newItem);
}
Or/and you can add unicity condition in your database, it would throw an...
How can I click a button behind a transparent UIView?
... You should also check the alpha of the view. Quite often I'll hide a view by setting the alpha to zero. A view with zero alpha should act like a hidden view.
– James Andrews
Dec 3 '13 at 17:19
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How can I use swift in Terminal?
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In Xcode 6.1.1 with Command Line Tools installed you can execute scripts by referencing directly to /usr/bin/swift the following way:
#!/usr/bin/swift
let variable: String = "string"
print("Test \(variable)")
share
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Docker - how can I copy a file from an image to a host?
... I also want to copy the build artifact (in my case it's a .zip produced by sbt dist in '../target/`, but I think this question also applies to jars, binaries, etc.
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How do I determine if a port is open on a Windows server? [closed]
...l a site under an alternative port on a server, but the port may be closed by a firewall. Is there a way to ping out or in, on a specific port, to see if it is open?
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psql: FATAL: role “postgres” does not exist
...ke your local install look a bit more traditional and avoid these problems by doing a one time:
/Applications/Postgres.app/Contents/Versions/9.*/bin/createuser -s postgres
which will make those FATAL: role "postgres" does not exist go away.
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How to send data to local clipboard from a remote SSH session
...rant ssh -c "command" | cat > /dev/clipboard)
– tiby
Jan 9 '16 at 19:35
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