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Feature #10729

open

Array method to subtract in place

Added by sawa (Tsuyoshi Sawada) over 6 years ago. Updated over 6 years ago.

Status:
Open
Priority:
Normal
Assignee:
-
Target version:
-
[ruby-core:67503]

Description

I request a method on array that takes another array, subtract that from self in place (= destructively), and return the subtracted elements:

a = [1, 2, 3, 4, 5]
a.some_method([2, 4, 6]) #=> [2, 4]
a #=> [1, 3, 5]

Ideally, it should also allow a block:

a = [1, 2, 3, 4, 5]
a.some_method(&:even?) #=> [2, 4]
a #=> [1, 3, 5]

This operation is quite frequent, but at the moment, it requires several steps to do.

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