Ruby
红宝石有每个缺点 https://ruby-doc.org/core-2.1.0/Enumerable.html#method-i-each_cons可以像这样使用
class Pair
def initialize(left, right)
@left = left
@right = right
end
end
votes = ["a", "b", "c", "d"]
pairs = votes.each_cons(2).map { |vote| Pair.new(*vote) }
p pairs
# [#<Pair @left="a", @right="b">, #<Pair @left="b", @right="c">, #<Pair @left="c", @right="d">]
Swift
Swift 中的相同代码,但没有each_cons
功能
struct Pair {
let left: String
let right: String
}
let votes = ["a", "b", "c", "d"]
var pairs = [Pair]()
for i in 1..<votes.count {
let left = votes[i-1]
let right = votes[i]
pairs.append(Pair(left: left, right: right))
}
print(pairs)
// [Pair(left: "a", right: "b"), Pair(left: "b", right: "c"), Pair(left: "c", right: "d")]
如何使这段快速代码变得更短或更简单?