在Ruby中,有没有办法轻松删除数组中的1个匹配？

Question

在Ruby中,数组减法或 reject

>> [1,3,5,7,7] - [7]
=> [1, 3, 5]

>> [1,3,5,7,7].reject{|i| i == 7}
=> [1, 3, 5]

将删除数组中的所有条目.是否容易删除1次？

Answer 1

>> a = [1,3,5,7,7]

>> a.slice!(a.index(7))
=> 7

>> a
=> [1,3,5,7]

Answer 2

我能想到的最好的是:

found = false
[1,3,5,7,7].reject{|i| found = true if !found && i == 7}

或破坏性地:

arr = [1, 2, 3, 5, 7, 7]
arr.delete_at( arr.index(7))
arr #=> [1, 2, 3, 5, 7]