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End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

File::Stat#size?

stat.size? → Integer or nil

Returns nil if stat is a zero-length file, the size of the file otherwise.

Example
File.stat("testfile").size?   #=> 66
File.stat("/dev/null").size?  #=> nil
See also #size #socket? #setuid? #sticky? also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0