Quickest way to check that a value in PHP only contains digits?
Tag : php , By : user98832
Date : March 29 2020, 07:55 AM

Quickest way to check internet connectivity in JS
Date : March 29 2020, 07:55 AM
it should still fix some issue navigator.onLine is the only builtin property which can be checked (and not reliable btw). You could create a XHR request to a reliable server, and check whether any response is being received.

quickest way in R to check that all columns are identical
Date : March 29 2020, 07:55 AM
Any of those help Suppose I have a matrix with 3 columns , You could try: all(m1[,1]==m1)
# [1] TRUE
all(m2[,1]==m2)
#[1] FALSE
m1 < matrix(c(10:1, 10:1, 10:1), ncol=3)
m2 < cbind(m1, 11:2)

Quickest way to check whether or not file exists
Date : March 29 2020, 07:55 AM

Quickest way to determine if a number is a prime number or not VB
Tag : vb.net , By : dyarborough
Date : March 29 2020, 07:55 AM
seems to work fine There are a great many prime testers out there, many of them on this site. For checking a single number I use a faster variant of your Code2 with a little extra checking. Here is the pseudocode: boolean function isPrime(num)
//1, 0 and negatives cannot be prime.
if (num < 2) then
return false
endif
// 2 is the only even prime.
if (num MOD 2 = 0) then
return (num = 2)
endif
// Check for odd factors.
limit < sqrt(num)
for (factor < 3; factor <= limit; factor < factor + 2) do
if (num MOD factor = 0) then
return false
endif
endfor
// If we reach this point then the number is prime.
return true
endfunction

