even_numbers = array.select { |x| x.even? } puts even_numbers.inspect # 输出: [2, 4] 7. 查找元素 include? 方法:检查数组中是否包含某个元素。 ruby array = [1, 2, 3] puts array.include?(2) # 输出: true find_index 方法:返回数组中第一个匹配元素的索引。 ruby array = [1, 2, ...
irb(main):008:0> x = Array.new(3) do |e| e = "a" end => ["a", "a", "a"] irb(main):009:0> x[0] << "b" => "ab" irb(main):010:0> x => ["ab", "a", "a"] 当然还可以如下创建数组: QUOTE: irb(main):012:0> x = Array.[](1,2,3) => [1, 2, 3] ...
问如何对Ruby数组中的多个值执行find_index？EN在Ruby1.8.7和1.9中，在没有块的情况下调用迭代器方...
https://ruby-doc.org/core-2.5.0/Array.html#method-i-delete 13.2 创建 > a = Array.new => [] > b = Array.new(5) => [nil, nil, nil, nil, nil] > c = Array.new(5, "hello") => ["hello", "hello", "hello", "hello", "hello"] Array.new(长度,初始值) #=>new(size=0...
解释:通过上述例子我们可以看到,我们在每次迭代出来的元素是一个Array,第一个元素是每个键值对的键,第二个元素是每个键值对的值。 1.1 each_key 和 each_value 对于哈希,我们还可以只迭代其值或者键。这里我们有2个方法,一个是each_key,一个是each_value,它们分别迭代哈希的所有键和所有值: ...
==>120puts'Too long!'Time.now.hour>21puts.name=='Misty'puts'Not again!'whensong.duration>120puts'Too long!'whenTime.now.hour>21puts"It's too late"elsesong.playend This is the style established in both "The Ruby Programming Language" and "Programming Ruby". Historically it is derived ...
rgn = Region.find(cty.region.id) puts 'Countries in the same region with [' + cty.name + ']' rgn.countries.each { |country| puts ' - ' + country.name } puts '-'*80 使用迁移和结构构建 Ruby on Rails 应用程序 在本教程的其余部分,您将使用以下术语: ...
Ruby.Array.create Ruby.Array.of ra Ruby.Array.copyOf newRubyArray Ruby.Hash.create Hash Ruby.Hash.of rh Ruby.Hash.copyOf newRubyHash Ruby.Entry.of hp Ruby.Set.create Ruby.Set.of Ruby.Set.copyOf newRubySet Ruby.Enumerator.of Ruby.Enumerator.copyOf newRubyEnumerator Ruby.LazyEnumerator...
Page is in fragment array of fseg 1. Fseg is in internal fseg of index 44. Index root is page 3. Index is testdb/test1.PRIMARY. # innodb_space -s ibdata1 -T testdb/test1 -p 4 page-account Accounting for page 4: Page type is INDEX (B+Tree index, table and index data stored...
attr_reader users: Array[User | Bot] # `|` means union types, `User` or `Bot`. def initialize: (String) -> void def post: (String, from: User | Bot) -> Message # Method overloading is supported. | (File, from: User | Bot) -> Message ...