I found the following logic as a way to Shuffle Array in Swift.
extension Array {
mutating func shuffle() {
for in 0..<(count-1){
let j = Int(arc4 random_uniform(UInt32(count-i))))) + i
swap(&self[i], &self[j])
}
}
}
For example, what should I do if I want to set the date to Seed and cause randomness?
muting func sshuffle (seed:Int)
What I'm thinking about is how to take Int as seed and shuffle it (in pseudo-random numbers) like this.
追Add
I made the following logic, but what do you think?
muting func sshuffle(seed:Int){
sland(UInt32(seed))
letr = land()
for in 0..<(count-1){
let j = Int(r%Int32(count-i))+i
swap(&self[i], &self[j])
}
}
import Foundation (same as import UIKit) allows Swift to use all functions in the standard library of C language, both sland() and land().
(arc4 random_uniform() also requires import Foundation...)
For 追Additions記:
Does "What do you think?" mean by evaluating the program?
arc4Random(), arc4Random_uniform() are designed to provide uniformity and higher quality than the rand() function in the C language standard library.If you don't use them and you use the rand() function, your rating will be low.
muting func sshuffle(seed:Int){
sland(UInt32(seed))
letr = land()
for in 0..<(count-1){
let j = Int(r%Int32(count-i))+i
swap(&self[i], &self[j])
}
}
The shuffle operation algorithm uses Fisher – Yates Shuffle, so there should be no problem.However, letr=land() must move into the loop.(Quote code does not show "random number sequence")
@As Harawa pointed out, using rand()%N to generate random numbers should be avoided in terms of pseudorandom sequence quality.
If you want to do a homogeneous shuffle, you can use arc4 random_uniform().However, as far as the document is concerned, it appears that you cannot give seed values to the arc4 random function.
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