Bug #15537: Numeric#step doesn't iterate under some conditions

• Status: Closed
• Assignee: mrkn (Kenta Murata)
• Target version: -
• ruby -v: ruby 2.6.0p0 (2018-12-25 revision 66547) [x86_64-linux]
• Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN

[shuujii (Shuji KOBAYASHI)]

Numeric#step doesn't iterate under the following conditions:

• receiver and/or by are Float
• by is negative
• to is default
• without block

Example:

Good:

p 1.step(by: 3).take(2)                                     #=> [1, 4]
p 1.step(by: -3).take(2)                                    #=> [1, -2]
p 1.step(by: 3.0).take(2)                                   #=> [1.0, 4.0]
p 1.0.step(by: 3).take(2)                                   #=> [1.0, 4.0]
a=[]; p 1.step(by: -3.0){|n|break a if (a << n).size == 2}  #=> [1.0, -2.0]
a=[]; p 1.0.step(by: -3){|n|break a if (a << n).size == 2}  #=> [1.0, -2.0]

Bad:

p 1.step(by: -3.0).take(2)  #=> []
p 1.0.step(by: -3).take(2)  #=> []

I have attached a patch.

[mrkn (Kenta Murata)]

• Status changed from Open to Assigned
• Assignee set to mrkn (Kenta Murata)

[mrkn (Kenta Murata)]

• Status changed from Assigned to Closed

Applied in changeset trunk|r66914.

---

numeric.c: Fix negative step with float components

• numeric.c (ruby_float_step): fix negative step with float components.

• test/ruby/test_numeric.c (test_step_bug15537): add tests.

• test/ruby/test_range.c (test_step_bug15537): add tests.

[Bug #15537] [ruby-core:91101]

From: shuujii (Shuji KOBAYASHI) [e-mail]