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If strings are immutable in .NET, then why does Substring take O(n) time?
... I've seen this sort of code quite a bit: string contents = File.ReadAllText(filename); foreach (string line in content.Split("\n")) ... or other versions of it. I mean read an entire file, then process the various parts. That sort of code would be considerably faster and require less memo...
How can I quickly delete a line in VIM starting at the cursor position?
...be appended to the line.
This is part of vitutor and vimtutor, excellent "reads" for vim beginners.
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When to use in vs ref vs out
...ue when the method doesn't make use of it.
Beyond that, it also shows the reader of the declaration or the call whether the initial value is relevant (and potentially preserved), or thrown away.
As a minor difference, an out parameter needs not be initialized.
Example for out:
string a, b;
perso...
Hidden features of Python [closed]
...rgument
For instance:
def seek_next_line(f):
for c in iter(lambda: f.read(1),'\n'):
pass
The iter(callable, until_value) function repeatedly calls callable and yields its result until until_value is returned.
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javac not working in windows command prompt
...bles
In "System Variables", scroll down to select "PATH" ⇒ Edit
(( now read the following 3 times before proceeding, THERE IS NO UNDO ))
In "Variable value" field, INSERT "c:\Program Files\Java\jdk1.8.0_xx\bin" (Replace xx with the upgrade number and VERIFY that this is your JDK's binary direct...
Python `if x is not None` or `if not x is None`?
...is y. Although the compiler will always treat it as not (x is y), a human reader might misunderstand the construct as (not x) is y. If I write x is not y then there is no ambiguity.
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Why is 'this' a pointer and not a reference?
I was reading the answers to this question C++ pros and cons and got this doubt while reading the comments.
2 Answers
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Is there an alternative to string.Replace that is case-insensitive?
...tion is actually much larger than the specific question being asked. After reading through, I'm not sure any answer is a few edits away from assimilating all the good stuff here, so I figured I'd try to sum.
Here's an extension method that I think avoids the pitfalls mentioned here and provides the...
What is a “translation unit” in C++
I am reading at the time the "Effective C++" written by Meyers
and came across the term "translation unit".
11 Answers
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PowerShell and the -contains operator
... you're working with a collection containing just one string item.
If you read the documentation you linked to you'll see an example that demonstrates this behaviour:
Examples:
PS C:\> "abc", "def" -Contains "def"
True
PS C:\> "Windows", "PowerShell" -Contains "Shell"
False #Not an exact ...