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what is the difference between ?:, ?! and ?= in regex?
I searched for the meaning of these expressions but couldn't understand the exact difference between them.
This is what they say:
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What is the use of Enumerable.Zip extension method in Linq?
...ative. B) Write a method to yield return each element of the shorter list, and then continue yield returning default indefinitely thereafter. (Option B requires you to know in advance which list is shorter.)
– jpaugh
Jul 7 '17 at 21:41
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What's the difference between a web site and a web application? [closed]
I'm stumped trying to come up to a difference between a website and a web application for myself. As I see it, a web site points to a specific page and a web application is more of some sort of 'portal' to content and information.
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find vs find_by vs where
...is used as a helper when you're searching for information within a column, and it maps to such with naming conventions. For instance, if you have a column named name in your database, you'd use the following syntax:
Model.find_by(name: "Bob")
.where is more of a catch all that lets you use a bit...
Safari 3rd party cookie iframe trick no longer working?
...k the playing field has changed, perhaps after February 2012. One of the standard tricks to get 3rd party cookies in Safari was as follows: use some javascript to POST to a hidden iframe. It (used to) trick Safari into thinking that the user had interacted with the 3rd party content and so then allo...
Why does a return in `finally` override `try`?
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@Castrohenge - it's not a hard and fast rule, but most of the copunter-examples in that thread are pretty contrived, and the only valid case I see is the "guard clause" (essentially the pattern of checking input data at the top of the function and returnin...
What is the fastest way to get the value of π?
... fastest π I know of is the one with the digits hard coded. Looking at Pi and Pi[PDF], there are a lot of formulae.
Here is a method that converges quickly — about 14 digits per iteration. PiFast, the current fastest application, uses this formula with the FFT. I'll just write the formula, since...
Array Size (Length) in C#
...nt[,] b = new int[3, 5];)
b.Rank
will give the number of dimensions (2) and
b.GetLength(dimensionIndex)
will get the length of any given dimension (0-based indexing for the dimensions - so b.GetLength(0) is 3 and b.GetLength(1) is 5).
See System.Array documentation for more info.
As @Lucero ...
Which parts of Real World Haskell are now obsolete or considered bad practice?
...rsion 3.0.x.x. 6.10.1 already used 4.0.0.0, which introduced many changes. And that's just the jump from 6.8 to 6.10. The current version of GHC is 7.10. Monads have been changed. There's currently a discussion to remove return from Monad, so the Monad instance in Real World Haskell will really be o...
Convert Rows to columns using 'Pivot' in SQL Server
I have read the stuff on MS pivot tables and I am still having problems getting this correct.
8 Answers
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