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Bash tool to get nth line from a file
... performance differences, these are the number that I get for a huge file (9.3G):
tail -n+N | head -1: 3.7 sec
head -N | tail -1: 4.6 sec
sed Nq;d: 18.8 sec
Results may differ, but the performance head | tail and tail | head is, in general, comparable for smaller inputs, and sed is always slower...
Operator overloading in Java
...but an example is worth a thousand arguments. Given m0 as a Matrix and v0, v1, v2, v3, and v4 as Vectors, simply compare how long it takes you to correctly interpret the following mathematical expression m0.transpose().mult(v0.add(v1.mult(v2)).cross(v3)).sub(v4);. Had support for operator overloadin...
Why can't variable names start with numbers?
...equire the uses of spaces. So, basically, the following are identical:
10 V1=100
20 PRINT V1
and
10V1=100
20PRINTV1
Now suppose that numeral prefixes were allowed. How would you interpret this?
101V=100
as
10 1V = 100
or as
101 V = 100
or as
1 01V = 100
So, this was made illegal.
...
Instagram how to get my user id from username?
...ers name you want to find and your access token
https://api.instagram.com/v1/users/search?q=[USERNAME]&access_token=[ACCESS TOKEN]
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How can I verify a Google authentication API access token?
...sToken and post it and get the response
https://www.googleapis.com/oauth2/v1/tokeninfo?access_token=accessToken
you can try in address bar in browsers too, use httppost and response in java also
response will be like
{
"issued_to": "xxxxxxxxxxxxx-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.apps.go...
Choice between vector::resize() and vector::reserve()
...ates memory, it doesn't create instances. That is,
std::vector<int> v1;
v1.resize(1000); //allocation + instance creation
cout <<(v1.size() == 1000)<< endl; //prints 1
cout <<(v1.capacity()==1000)<< endl; //prints 1
std::vector<int> v2;
v2.reserve(1000); //onl...
Passing route control with optional parameter after root in express?
...h handy, you can declare and use them easily using express:
app.get('/api/v1/tours/:cId/:pId/:batchNo?', (req, res)=>{
console.log("category Id: "+req.params.cId);
console.log("product ID: "+req.params.pId);
if (req.params.batchNo){
console.log("Batch No: "+req.params.batchNo...
What's the difference between a catalog and a schema in a relational database?
...ne, for testing and deploying new versions of Postgres (ex: 9.0, 9.1, 9.2, 9.3, 9.4, 9.5).
If you did have multiple clusters, imagine the diagram above duplicated.
Different port numbers allow the multiple clusters to live side-by-side all up and running at the same time. Each cluster would be as...
How do you compare two version Strings in Java?
... compare("1.a", "1.9");
}
private static void compare(String v1, String v2) {
String s1 = normalisedVersion(v1);
String s2 = normalisedVersion(v2);
int cmp = s1.compareTo(s2);
String cmpStr = cmp < 0 ? "<" : cmp > 0 ? ">" : "==";
Syst...
Using forked package import in Go
...hlonkar/openapi-to-postman
go 1.12
require (
github.com/someone/repo v1.20.0
)
replace github.com/someone/repo => github.com/you/repo v3.2.1
where v3.2.1 is tag on your repo. Also can be done through CLI
go mod edit -replace="github.com/someone/repo@v0.0.0=github.com/you/repo@v1.1.1"
...