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How can I declare and use Boolean variables in a shell script?
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Revised Answer (Feb 12, 2014)
the_world_is_flat=true
# ...do something interesting...
if [ "$the_world_is_flat" = true ] ; then
echo 'Be careful not to fall off!'
fi
Original Answer
Caveats: https://stackoverflow.com/a/21210966/89391
the_w...
Get first key in a (possibly) associative array?
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2019 Update
Starting from PHP 7.3, there is a new built in function called array_key_first() which will retrieve the first key from the given array without resetting the internal pointer. Check out the documentation for more ...
Generating random integer from a range
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105
A fast, somewhat better than yours, but still not properly uniform distributed solution is
out...
How to automatically reload a page after a given period of inactivity
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function refresh() {
if(new Date().getTime() - time >= 60000)
window.location.reload(true);
else
setTimeout(refresh, 10000);
}
setTimeout(refresh, 10000);
</script>
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What Every Programmer Should Know About Memory?
...of Ulrich Drepper's What Every Programmer Should Know About Memory from 2007 is still valid. Also I could not find a newer version than 1.0 or an errata.
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Scroll to the top of the page using JavaScript?
... - I'd just use the native JavaScript window.scrollTo method -- passing in 0,0 will scroll the page to the top left instantly.
window.scrollTo(x-coord, y-coord);
Parameters
x-coord is the pixel along the horizontal axis.
y-coord is the pixel along the vertical axis.
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What is the difference between the states selected, checked and activated in Android?
...d);
}
}
Thanks to the following:
http://sriramramani.wordpress.com/2012/11/17/custom-states/
Stackoverflow: How to add a custom button state
Stackoverflow: Custom Checkable View which responds to Selector
http://www.charlesharley.com/2012/programming/custom-drawable-states-in-android/
htt...
SensorUtil 传感器工具扩展：在后台和屏幕关闭时保持传感器工作 · App Inv...
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版本
日期
修改内容
1.0
2025-10-09
初始版本
工作原理
前台服务
Android 限制后台应用的活动以节省电池。要在后台持续运行，应用必须启动前...
How can I convert an image into Base64 string using JavaScript?
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10
This approach fails in the case of CORS violation. Apart from that, this solution should address the question.
– Revan...
Removing double quotes from variables in batch file creates problems with CMD environment
...the following code to a batch file .cmd or .bat and run):
@ECHO OFF
ECHO %0
SET BathFileAndPath=%~0
ECHO %BathFileAndPath%
ECHO "%BathFileAndPath%"
ECHO %~0
ECHO %0
PAUSE
Output:
"C:\Users\Test\Documents\Batch Files\Remove Quotes.cmd"
C:\Users\Test\Documents\Batch Files\Remove Quotes.cmd
"C:\Use...