[ruby-core:121798] [Ruby Feature#21300] Suggestion: Method for Array truncation

Issue #21300 has been reported by sigsys (Math Ieu). ---------------------------------------- Feature #21300: Suggestion: Method for Array truncation https://bugs.ruby-lang.org/issues/21300 * Author: sigsys (Math Ieu) * Status: Open ---------------------------------------- `#pop(n)` and `#slice!(...)` can be used for truncation, but they both allocate a new array for the deleted elements (unless you do it one at a time with `#pop()`...), which is not always needed. I propose adding a `#size=` method for truncating without allocating a new array: ``` a = [10, 20, 30] a.size = 2 a # [10, 20] ``` Growing the array could be allowed as well... ``` a = [10, 20] a.size = 4 a # [10, 20, nil, nil] ``` -- https://bugs.ruby-lang.org/