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A snippet of R code to generate a version 4 (random) UUID.
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| ## Version 4 UUIDs have the form xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx | |
| ## where x is any hexadecimal digit and y is one of 8, 9, A, or B | |
| ## e.g., f47ac10b-58cc-4372-a567-0e02b2c3d479 | |
| uuid <- function(uppercase=FALSE) { | |
| hex_digits <- c(as.character(0:9), letters[1:6]) | |
| hex_digits <- if (uppercase) toupper(hex_digits) else hex_digits | |
| y_digits <- hex_digits[9:12] | |
| paste( | |
| paste0(sample(hex_digits, 8, replace=TRUE), collapse=''), | |
| paste0(sample(hex_digits, 4, replace=TRUE), collapse=''), | |
| paste0('4', paste0(sample(hex_digits, 3, replace=TRUE), collapse=''), collapse=''), | |
| paste0(sample(y_digits,1), paste0(sample(hex_digits, 3, replace=TRUE), collapse=''), collapse=''), | |
| paste0(sample(hex_digits, 12, replace=TRUE), collapse=''), | |
| sep='-') | |
| } |
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