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What is the difference between .map, .every, and .forEach?
...rtant difference with .every() is that the test function may not always be called for every element in the array. Once the testing function returns false for any element, no more array elements are iterated. Therefore, the testing function should usually have no side effects.
.forEach() returns n...
Save classifier to disk in scikit-learn
...b.load should not raise an exception after a successful joblib.dump if you call it from a Python with the same version of the scikit-learn library.
– ogrisel
Jan 6 '14 at 9:52
11
...
Where is Erlang used and why? [closed]
...ang in its SMS and authentication systems.
• Motorola is using Erlang in call processing products in the public-safety industry.
• Ericsson uses Erlang in its support nodes, used in GPRS and 3G mobile networks
worldwide.
The most popular open source Erlang applications include the following:
...
MySQL ON DUPLICATE KEY - last insert id?
...e.html
At the bottom of the page they explain how you can make LAST_INSERT_ID meaningful for updates by passing an expression to that MySQL function.
From the MySQL documentation example:
If a table contains an AUTO_INCREMENT column and INSERT ... UPDATE inserts a row, the LAST_INSERT_ID() func...
How to get cumulative sum
...
select t1.id, t1.SomeNumt, SUM(t2.SomeNumt) as sum
from @t t1
inner join @t t2 on t1.id >= t2.id
group by t1.id, t1.SomeNumt
order by t1.id
SQL Fiddle example
Output
| ID | SOMENUMT | SUM |
-----------------------
| 1 | 1...
How does “do something OR DIE()” work in PHP?
...
This is called short-circuit evaluation and is useful in languages other than PHP as well.
– Mr Griever
Feb 8 '11 at 23:25
...
Minimal web server using netcat
... trying to set up a minimal web server using netcat (nc). When the browser calls up localhost:1500, for instance, it should show the result of a function ( date in the example below, but eventually it'll be a python or c program that yields some data).
My little netcat web server needs to be a whil...
How can you find the height of text on an HTML canvas?
...nce. One wonders, which value would be most useful (not necessarily technically correct).
– Orwellophile
May 23 '13 at 7:51
...
nodejs require inside TypeScript file
...t of default definitions for window, document and such specified in a file called lib.d.ts. If I do a grep for require in this file I can find no definition of a function require. Hence, we have to tell the compiler ourselves that this function will exist at runtime using the declare syntax:
declar...
Efficiently convert rows to columns in sql server
... from yourtable
group by ColumnName, id
order by id
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set @query = N'SELECT ' + @cols + N' from
(
select value, Column...