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QRCodeGenerator 拓展：根据给定的文本生成二维码 · App Inventor 2 中文网
...+ js + Web浏览器 生成二维码的方案：https://puravidaapps.com/qr.php
aix拓展下载
cn.fun123.QRCodeGenerator.aix
demo下载
TestQRCodeGenerator.aia
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Check if list contains element that contains a string and get that element
...t[i].Contains(myString)) // (you use the word "contains". either equals or indexof might be appropriate)
{
return i;
}
}
Old fashion loops are almost always the fastest.
share
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im...
mongoose vs mongodb (nodejs modules/extensions), which better? and why?
... abstraction layer will be way smaller, then mongoose's.
I'm coming from PHP world, there we had raw sql with depreciated mysql_ functions, then we got PDO - object orientated abstraction layer to communicate with sql. Or you can choose some heavy ORM like Doctrine to have similar stuff to mongoos...
What is the difference between substr and substring?
...ference is in the second argument. The second argument to substring is the index to stop at (but not include), but the second argument to substr is the maximum length to return.
Links?
https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/substr
https://developer.mozilla.org...
How do I use shell variables in an awk script?
...-v b="$var2" 'BEGIN {print a,b}'
Warning. As Ed Morton writes, escape sequences will be interpreted so \t becomes a real tab and not \t if that is what you search for. Can be solved by using ENVIRON[] or access it via ARGV[]
PS If you like three vertical bar as separator |||, it can't be escaped...
BigDecimal equals() versus compareTo()
...
The answer is in the JavaDoc of the equals() method:
Unlike compareTo, this method considers two BigDecimal objects equal only if they are equal in value and scale (thus 2.0 is not equal to 2.00 when compared by this method).
In other words: equals() check...
Is 1.0 a valid output from std::generate_canonical?
...(0xffffffd9u), which when rounded to 32-bit float gives 0x1p+32, which is equal to the max value of mt19937, 4294967295 (0xffffffffu) when that is also rounded to 32-bit float.
The standard could ensure correct behavior if it were to specify that when converting from the output of the URNG to the R...
Why are only final variables accessible in anonymous class?
...
stackoverflow.com/questions/7472195/…
– Ustaman Sangat
Sep 19 '11 at 14:04
11
...
How can I wrap text to some length in Vim?
...you can reformat your text by highlighting it (in visual mode) and typing gq. (textwidth can be abbreviated as tw, thus :set tw=30.)
Option 2 can be toggled by running :set wrap / :set nowrap. This will wrap lines which are too long for the window.
Both are independent.
...
Const in JavaScript: when to use it and is it necessary?
...
There are two aspects to your questions: what are the technical aspects of using const instead of var and what are the human-related aspects of doing so.
The technical difference is significant. In compiled languages, a constant will be replaced at compi...