Question

foo = [3, 6, 3]
for a in foo:
    print a

我如何在红宝石中做到这一点？

Answer 1

list = %w( a b c )

# there's a for statement but nobody likes it :P
for item in list
  puts item
end

# so you use the each method with a block instead

# one-liner block
list.each { |item| puts item }

# multi-line block
list.each do |item|
  puts item
end

Answer 2

foo = [3, 6, 3]
foo.each do |a|
  puts a
end

Answer 3

foo = [1, 2, 3]
foo.each do |x|
    puts x
end

Answer 4

你已经有了关于“for”-loop的正确答案。但在完全你的例子中，我将使用：

puts foo

在这种情况下你也可以使用这个'puts'功能：

puts array.map { |i| ...some code...; x }

而不是

array.each { |i| ...some code...; puts x }

例如，如果您只想调用一次。

你如何在Ruby中执行python“for-each”？

4 个答案: