ruby - Chef 和 ruby​​：如何将数组转换为集合

Question

我有一个看起来像这样的数组：

nodes = ['server1','server1','server2']

在厨师食谱中，我需要在传递给模板 erb 之前转换为一组。我怎么做？

Answer 1

This pattern works with Set, Matrix, JSON etc.; it is the first thing to try.

require 'set'
nodes = ['server1','server1','server2']
p nodes.to_set # #<Set: {"server1", "server2"}>

Answer 2

如果你想让它唯一（因为一个集合是唯一的）但仍然是一个数组，你可以使用 |[]

nodes = ['server1','server1','server2']
nodes|[] 
# or nodes |= [] # for inplace operation

# => ["server1", "server2" ]