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Failed to Attach to Process ID Xcode
... cannot resolve localhost: Unknown host something is screwed up with your /etc/hosts file, go to Step 2
Step2: Check /etc/hosts
Check that the top of your /etc/hosts file looks like this
127.0.0.1 localhost
255.255.255.255 broadcasthost
::1 localhost
fe80::1%lo0 localhost
If ...
What's the point of map in Haskell, when there is fmap?
... [b] -- Defined in ‘GHC.Base’
and you'll see it defined as an high-order function applicable to a list of values of any type a yielding a list of values of any type b. Although polymorphic (the a and b in the above definition stand for any type) the map function is intended to be applied to ...
Remove duplicate rows in MySQL
...owing columns:
employee (id, first_name, last_name, start_date, ssn)
In order to delete the rows with a duplicate ssn column, and keeping only the first entry found, the following process can be followed:
-- create a new tmp_eployee table
CREATE TABLE tmp_employee LIKE employee;
-- add a unique...
Use of 'const' for function parameters
... It’s like when the bad guy promises not to kill someone in a movie and orders his henchman to kill them instead.
Those superfluous const’s are worth no more than a promise from a movie bad-guy.
But the ability to lie gets even worse:
I have been enlightened that you can mismatch const in ...
Can you have multiple $(document).ready(function(){ … }); sections?
...'Hello Dexter!');
});
You'll find that it's equivalent to this, note the order of execution:
$(document).ready(function() {
alert('Hello Tom!');
alert('Hello Jeff!');
alert('Hello Dexter!');
});
It's also worth noting that a function defined within one $(document).ready block cannot...
How do I delete a fixed number of rows with sorting in PostgreSQL?
...DELETE FROM logtable
WHERE ctid IN (
SELECT ctid
FROM logtable
ORDER BY timestamp
LIMIT 10
)
The ctid is:
The physical location of the row version within its table. Note that although the ctid can be used to locate the row version very quickly, a row's ctid will change if it is...
Using .sort with PyMongo
...er", 1), ("date", -1)])
The reason why this has to be a list is that the ordering of the arguments matters and dicts are not ordered in Python < 3.6
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Merge and interleave two arrays in Ruby
...
This won't give a result array in the order Chris asked for, but if the order of the resulting array doesn't matter, you can just use a |= b. If you don't want to mutate a, you can write a | b and assign the result to a variable.
See the set union documentation ...
Operator precedence with Javascript Ternary operator
...ach type of operator in a language is evaluated in a particular predefined order (and not just left-to-right).
Reference: Javascript Operator Precedence
How to change the order of evaluation:
Now we know why it fails, you need to know how to make it work.
Some other answers talk about changing t...
Filling a DataSet or DataTable from a LINQ query result set
...has a CopyToDataTable method:
IEnumerable<DataRow> query =
from order in orders.AsEnumerable()
where order.Field<DateTime>("OrderDate") > new DateTime(2001, 8, 1)
select order;
// Create a table from the query.
DataTable boundTable = query.CopyToDataTable<DataRow>(...