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When to encode space to plus (+) or %20?
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+ means a space only in application/x-www-form-urlencoded content, such as the query part of a URL:
http://www.example.com/path/foo+bar/path?query+name=query+value
In this URL, the parameter name is query name with a space and the value is query value with a...
Convert integer to hexadecimal and back again
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// Store integer 182
int intValue = 182;
// Convert integer 182 as a hex in a string variable
string hexValue = intValue.ToString("X");
// Convert the hex string back to the number
int intAgain = int.Parse(hexValue, System.Globalization.NumberStyles.HexNumber);
from http://www.geekpedia.com/KB...
git reset --hard HEAD leaves untracked files behind
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Also -x if you want to remove your .gitignored files and get back to a pristine state.
– jtdubs
Dec 1 '10 at 19:45
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How to keep environment variables when using sudo
... I use any command with sudo the environment variables are not there. For example after setting HTTP_PROXY the command wget works fine without sudo . However if I type sudo wget it says it can't bypass the proxy setting.
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Swift variable decorations with “?” (question mark) and “!” (exclamation mark)
... you don't check for nil you'll get a runtime error)
// Cannot be nil
var x: Int = 1
// The type here is not "Int", it's "Optional Int"
var y: Int? = 2
// The type here is "Implicitly Unwrapped Optional Int"
var z: Int! = 3
Usage:
// you can add x and z
x + z == 4
// ...but not x and y, becau...
Watermark / hint text / placeholder TextBox
How can I put some text into a TextBox which is removed automatically when user types something in it?
33 Answers
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How to equalize the scales of x-axis and y-axis in Python matplotlib?
...i to do this:
from matplotlib import pyplot as plt
plt.plot(range(5))
plt.xlim(-3, 3)
plt.ylim(-3, 3)
plt.gca().set_aspect('equal', adjustable='box')
plt.draw()
doc for set_aspect
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How to sort an array by a date property
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the first eg syntax gives error on angular7 : The left-hand side of an arithmetic operation must be of type 'any', 'number', 'bigint' or an enum type
– SURENDRANATH S
Jan 2 at 13:05
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How to free memory in Java?
... the garbage collector.
This memory management whitepaper (PDF) may help explain what's going on.
You can also call System.gc() to suggest that the garbage collector run immediately. However, the Java Runtime makes the final decision, not your code.
According to the Java documentation,
Call...
Why does this loop produce “warning: iteration 3u invokes undefined behavior” and output more than 4
...ake sense.
C++11 draft N3337: §5.4:1
If during the evaluation of an expression, the result is not mathematically defined or not in the range of
representable values for its type, the behavior is undefined. [ Note: most existing implementations of C++
ignore integer overflows. Treatment ...