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How to check if string input is a number? [duplicate]
How do I check if a user's string input is a number (e.g. -1 , 0 , 1 , etc.)?
24 Answers
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Determine the process pid listening on a certain port
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125
The -p flag of netstat gives you PID of the process:
netstat -l -p
Edit: The command that i...
How do I test for an empty string in a Bash case statement?
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127
The case statement uses globs, not regexes, and insists on exact matches.
So the empty string...
How to wait for all goroutines to finish without using time.Sleep?
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175
You can use sync.WaitGroup. Quoting the linked example:
package main
import (
"net/h...
Restore LogCat window within Android Studio
I have recently started to use Android Studio v0.1.1, And i can't seem to find LogCat... Is it gone? Or if not, how can I enable it?
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matplotlib Legend Markers Only Once
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This should work:
legend(numpoints=1)
BTW, if you add the line
legend.numpoints : 1 # the number of points in the legend line
to your matplotlibrc file, then this will be the new default.
[See also scatterpoints, depending on your plot.]
API: L...
What is the scope of variables in JavaScript?
...function f() {
function g() {
console.log(x)
}
let x = 1
g()
}
f() // 1 because x is hoisted even though declared with `let`!
Function parameter names
Function parameter names are scoped to the function body. Note that there is a slight complexity to this. Functions dec...
How to clear the canvas for redrawing
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1338
const context = canvas.getContext('2d');
context.clearRect(0, 0, canvas.width, canvas.height...
How can I clear the SQL Server query cache?
...ome good explaination. check out it.
http://www.mssqltips.com/tip.asp?tip=1360
CHECKPOINT;
GO
DBCC DROPCLEANBUFFERS;
GO
From the linked article:
If all of the performance testing is conducted in SQL Server the best approach may be to issue a CHECKPOINT and then issue the DBCC DROPCLEANBUF...
Check if null Boolean is true results in exception
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173
When you have a boolean it can be either true or false. Yet when you have a Boolean it can be ...