Sometimes, you want to know if an array contains one or more elements based on a test function.[1,2,3,4].any? { |n| n > 2 } # => trueIf you need to get the first object that matches your criteria, you can use find.[
new_array = array.map { |item| item * 2 } puts new_array.inspect 9. select 和 find_all 方法 select 和 find_all 方法用于从集合中选择符合条件的元素。 ruby array = [1, 2, 3, 4, 5] selected_array = array.select { |item| item.even? } puts selected_array.inspect 10. inject 和 ...
coll).each do |item| # good (0...coll).each do |item|NewlinesAdd a new line after if conditions spanning multiple lines to help differentiate between the conditions and the body. [link] if @reservation_alteration.checkin == @reservation.start_date && @reservation_alteration.checkout == ...
puts("array test: ") temp = [1,2,3,5] print(temp);puts(); for i in 1...5 if temp.include?(i) printf("temp include %d\n", i) else #printf("temp has no member of %d\n", i) puts("temp has no member of #{i}") end end puts("---") puts("hash test: ") temp =...
chomp.to_i puts "Enter the end index you want to put element in:" endi = gets.chomp.to_i if(endi<array_instance.count && start>0) for i in start..endi puts "Enter the element:" array_instance[i] = gets.chomp end else puts "Index out of bound" end # printing the array puts...
delete_if drop_while reverse_each Boolean Enumerable methods all? any? one? none? empty? Methods for combining & + - union difference product How to check if a value exists in an Array (include?) How to get array size How to clear an Array How to get the first element of an Arra...
Example (code fragments) of adding a bundle line item, to an invoice:items = service.find_by(:sku, 'AHH_SWEETS') bundle = items.entries.first # be sure to check if you found the bundle you want # ... line_item = Quickbooks::Model::InvoiceLineItem.new line_item.description = ...
array_name = Array.new(size = 0, obj = nil) Parameters Arguments play a very important role in this method. This method will take two arguments, the first one is the size and the second one is the element. If you don't provide any arguments, it will result in an empty Array with...
拼音delete_if块 、、 这是使用Ruby1.9。我有一个delete_if块:其中logItem.name是logItem的名称,name是我要查找的logItem的名称。除了删除具有指定name的每个logItem之外,它可以很好地工作。有没有办法找到第一个具有相等name的项目并只删除它?因此,如 浏览1提问于2011-02-04得票数 1 回答已采纳 ...
for i in 0..4 puts "i is #{i}" end 4. each 迭代 each 方法是 Ruby 中最常用的迭代方法之一,用于遍历数组、哈希等集合。 ruby array = [1, 2, 3, 4, 5] array.each do |item| puts "Item is #{item}" end 5. times 方法