在Ruby中，尝试在给定的哈希上使用.each do

Question

这就是我正在尝试做的事情：

编写一个方法，该方法采用哈希值并在城市较大（超过 100，000）或较小（否则）时打印。打印类似的东西：温哥华是一个大城市。

这是我提供的哈希值：

bc_cities_population = {vancouver: 2135201, victoria:  316327, abbotsford: 149855, kelowna: 141767, nanaimo:  88799, white_rock: 82368, kamloops: 73472, chilliwack: 66382 }

这是我的代码：

bc_cities_population = {vancouver: 2135201, victoria:  316327, abbotsford: 149855, kelowna: 141767, nanaimo:  88799, white_rock: 82368, kamloops: 73472, chilliwack: 66382 }
bc_cities_population.each do |city, population|  
if population > 100,000
  puts "#{city} is a big ol city!"
elsif 
  puts "#{city}city is a tiny ol town"
  end
end

感谢您的帮助..

编辑：这是我收到的错误。

 ruby big_small_city.rb
big_small_city.rb:1: syntax error, unexpected tINTEGER, expecting keyword_do or '{' or '('
...er: 2135201, victoria:  316327, abbotsford: 149855, kelowna...

编辑2：

这是我修改后的代码，我仍然不确定为什么不起作用。

bc_cities_population = {vancouver: 2135201, victoria:  316327, abbotsford: 149855, kelowna: 141767, nanaimo:  88799, white_rock: 82368, kamloops: 73472, chilliwack: 66382 }
bc_cities_population.each do |city, population|  
  if population > 100_000
    puts "#{city} is a big ol city!"
  else
    puts "#{city} is a tiny ol town"
  end
end

Answer 1

你应该写

bc_cities_population = {vancouver: 2135201, victoria:  316327, abbotsford: 149855, kelowna: 141767, nanaimo:  88799, white_rock: 82368, kamloops: 73472, chilliwack: 66382 }
bc_cities_population.each do |city, population|  
  if population > 100_000
    puts "#{city} is a big ol city!"
  else
    puts "#{city}city is a tiny ol town"
  end
end

让我们运行它：

Arup-iMac:arup_ruby$ ruby test.rb
vancouver is a big ol city!
victoria is a big ol city!
abbotsford is a big ol city!
kelowna is a big ol city!
nanaimocity is a tiny ol town
white_rockcity is a tiny ol town
kamloopscity is a tiny ol town
chilliwackcity is a tiny ol town
Arup-iMac:arup_ruby$

您所做的拧干是 - if population > 100,000 - 100,000不是计算机数字的有效表示。您可以将其写为 100000 而不是 100_000 .但是，任意数量的下划线字符 （_） 都可以出现在数字文本中的数字之间的任何位置。例如，此功能使您能够分隔数字文本中的数字组，这可以提高代码的可读性。