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Feature #13153

open

Inconsistent sprintf formatting for 0 value

Added by RickHull (Rick Hull) about 8 years ago. Updated over 4 years ago.

Status:
Open
Assignee:
-
Target version:
-
[ruby-core:79236]
Tags:
core

Description

0.upto(5).map { |i| "%#0.2x" % i }

# expect: ["0x00", "0x01", "0x02", "0x03", "0x04", "0x05"]

# actual: ["00", "0x01", "0x02", "0x03", "0x04", "0x05"]

Notice that the 0x is omitted when i == 0. The 0x prefix is specified by '#' (and 'x') in the format string. If this is expected behavior, then it sure is surprising and undocumented AFAIK. goes back to double check

Behavior on 2.4.0 confirmed on 2.3.3 as well.

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