Quickest way to check if a number is in a set?

Quickest way to check if a number is in a set?

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Quickest way to check if a number is in a set?
Tag : javascript , By : user143729
Date : November 24 2020, 03:41 PM

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Quickest way to check that a value in PHP only contains digits?

Tag : php , By : user98832
Date : March 29 2020, 07:55 AM
I hope this helps . ctype_digit()

Quickest way to check internet connectivity in JS

Tag : javascript , By : user181345
Date : March 29 2020, 07:55 AM
it should still fix some issue navigator.onLine is the only built-in 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

Tag : r , By : omaidog
Date : March 29 2020, 07:55 AM
Any of those help Suppose I have a matrix with 3 columns , You could try:
 # [1] TRUE
 #[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

Tag : c , By : k19k
Date : March 29 2020, 07:55 AM
it should still fix some issue On Windows, there is PathFileExists().
On a POSIX system, you have stat() or access().

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

  // 2 is the only even prime.
  if (num MOD 2 = 0) then
    return (num = 2)

  // Check for odd factors.
  limit <- sqrt(num)
  for (factor <- 3; factor <= limit; factor <- factor + 2) do
    if (num MOD factor = 0) then
      return false

  // If we reach this point then the number is prime.
  return true

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