hash {rlang}R Documentation

Hashing

Description

The generated hash is guaranteed to be reproducible across platforms that have the same endianness and are using the same R version.

Usage

hash(x)

hash_file(path)

Arguments

x

An object.

path

A character vector of paths to the files to be hashed.

Details

These hashers use the XXH128 hash algorithm of the xxHash library, which generates a 128-bit hash. Both are implemented as streaming hashes, which generate the hash with minimal extra memory usage.

For hash(), objects are converted to binary using R's native serialization tools. On R >= 3.5.0, serialization version 3 is used, otherwise version 2 is used. See serialize() for more information about the serialization version.

Value

Examples

hash(c(1, 2, 3))
hash(mtcars)

authors <- file.path(R.home("doc"), "AUTHORS")
copying <- file.path(R.home("doc"), "COPYING")
hashes <- hash_file(c(authors, copying))
hashes

# If you need a single hash for multiple files,
# hash the result of `hash_file()`
hash(hashes)

[Package rlang version 1.1.4 Index]