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do { … } while (0) — what is it good for? [duplicate]
I've been seeing that expression for over 10 years now. I've been trying to think what it's good for. Since I see it mostly in #defines, I assume it's good for inner scope variable declaration and for using breaks (instead of gotos.)
...
How to find the size of localStorage
...xecute this snippet in JavaScript console (one line version):
var _lsTotal=0,_xLen,_x;for(_x in localStorage){ if(!localStorage.hasOwnProperty(_x)){continue;} _xLen= ((localStorage[_x].length + _x.length)* 2);_lsTotal+=_xLen; console.log(_x.substr(0,50)+" = "+ (_xLen/1024).toFixed(2)+" KB")};console...
Convert a binary NodeJS Buffer to JavaScript ArrayBuffer
...rayBuffer(buf.length);
var view = new Uint8Array(ab);
for (var i = 0; i < buf.length; ++i) {
view[i] = buf[i];
}
return ab;
}
From ArrayBuffer to Buffer:
function toBuffer(ab) {
var buf = Buffer.alloc(ab.byteLength);
var view = new Uint8Array(ab);
for (var i...
Replacing column values in a pandas DataFrame
... something like this:
w['female'] = w['female'].map({'female': 1, 'male': 0})
(Here I convert the values to numbers instead of strings containing numbers. You can convert them to "1" and "0", if you really want, but I'm not sure why you'd want that.)
The reason your code doesn't work is because...
How do I create/edit a Manifest file?
...
In Visual Studio 2010, 2012, 2013, 2015 and 2017 you can add the manifest file to your project.
Right click your project file on the Solution Explorer, select Add, then New item (or CTRL+SHIFT+A). There you can find Application Manifest File....
Float vs Decimal in ActiveRecord
...a Float. It's like a scientific notation for binary (something like +1.43*10^2). Because of that, it is impossible to store fractions and decimals in Float exactly.
That's why there is a Decimal format. If you do this:
irb:001:0> "%.47f" % (1.0/10)
=> "0.100000000000000005551115123125782702...
Format date and time in a Windows batch script
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150
I ended up with this script:
set hour=%time:~0,2%
if "%hour:~0,1%" == " " set hour=0%hour:~1,1%...
Python, remove all non-alphabet chars from string
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answered Mar 20 '14 at 0:36
limasxgoesto0limasxgoesto0
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autolayout - make height of view relative to half superview height
...ttribute inspector:
Then you can adjust the multiplier. If you want it 50% of the super view leave it at 1, since it is aligned per the super's center. This is also a great way to create views that are other percentages too (like 25% of super view)
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swift case falling through
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370
Yes. You can do so as follows:
var testVal = "hello"
var result = 0
switch testVal {
case "one...