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What does ~~ (“double tilde”) do in Javascript?
...verything after the decimal point because the bitwise operators implicitly convert their operands to signed 32-bit integers. This works whether the operands are (floating-point) numbers or strings, and the result is a number.
In other words, it yields:
function(x) {
if(x < 0) return Math.ceil...
What are transparent comparators?
...ned, existing code may pass through objects directly which would have been converted without the member templates. The example use-case from n3657 is locating an object in a std::set<std::string> using a string literal: with the C++11 definition a std::string object is constructed when passing...
Decoding and verifying JWT token using System.IdentityModel.Tokens.Jwt
..."myapp\",\"exp\":1460555281,\"nbf\":1457963281}";
var b64header = Convert.ToBase64String(Encoding.UTF8.GetBytes(header))
.Replace('+', '-')
.Replace('/', '_')
.Replace("=", "");
var b64claims = Convert.ToBase64String(Encoding.UTF8.GetBytes(claims)...
Count with IF condition in MySQL query
...COALESCE() as mentioned in other answers, many language APIs automatically convert NULL to '' when fetching the value. For example with PHP's mysqli interface it would be safe to run your query without COALESCE().
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How can I find non-ASCII characters in MySQL?
... problem.
SELECT whatever
FROM tableName
WHERE columnToCheck <> CONVERT(columnToCheck USING ASCII)
The CONVERT(col USING charset) function turns the unconvertable characters into replacement characters. Then, the converted and unconverted text will be unequal.
See this for more discuss...
Python vs Cpython
...uction set) which is Python specific and then executes it.
The reason to convert Python code to a bytecode is because it's easier to
implement an interpreter if it looks like machine instructions. But,
it isn't necessary to produce some bytecode prior to execution of the
Python code (but CPy...
How can I get sin, cos, and tan to use degrees instead of radians?
...It seems to me that it would be more useful to you to have a function that converts a degree input to radians, like this:
function toRadians (angle) {
return angle * (Math.PI / 180);
}
which you could use to do something like tan(toRadians(45)).
...
How do I search for an object by its ObjectId in the mongo console?
...wrote the answer if you are using mongodb using node.js
You don't need to convert the id into an ObjectId. Just use :
db.collection.findById('4ecbe7f9e8c1c9092c000027');
this collection method will automatically convert id into ObjectId.
On the other hand :
db.collection.findOne({"_id":'4ecbe7...
Easy way to turn JavaScript array into comma-separated list?
...
Here's an implementation that converts a two-dimensional array or an array of columns into a properly escaped CSV string. The functions do not check for valid string/number input or column counts (ensure your array is valid to begin with). The cells can c...
How do I use vi keys in ipython under *nix?
... following in your ~/.inputrc file:
set editing-mode vi
set keymap vi
set convert-meta on
Source: http://www.jukie.net/bart/blog/20040326082602
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