以下是一些常用的方法:使用Array#[]方法通过索引查找元素: arr = [1, 2, 3, 4, 5] element = arr[2] # element 的值为 3 复制代码使用Array#index方法通过值查找元素: arr = [1, 2, 3, 4, 5] element = arr.index(3) # element 的值为 2(因为3在数组中的索引为2) 复制代
array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] n = 3 result = array.select { |element| element > 5 }.take(n) 上述代码将从数组array中选择大于5的元素,并获取前3个元素。 在Ruby on Rails中,还有其他方法可以实现相同的功能,例如使用find_all方法和数组切片操作符[...]。...
// expected output: Array ["exuberant", "destruction", "present"] 7.find()方法 Array.prototype.find() find()方法返回数组中满足提供的测试函数的第一个元素的值。否则返回undefined。 const array1 = [5, 12, 8, 8, 44]; const found = array1.find(element => element > 10); console.log(f...
select {|obj| block } ->array#等同find_all 省略了if条件判断,反义词reject Returns an array containing all elements of enum for which the given block return returns a true value. 加!号则是改变自身。 (1..10).find_all{|i|i%3==0}#=> [3, 6, 9] each_slice(n) {...} -> nil It...
数组| Array Base64 基本对象 | BasicObject 基准测试 | Benchmark BigDecimal 绑定| Binding CGI 类| Class 比较| Comparable 负责| Complex 计算续体 | Continuation 覆盖| Coverage CSV 日期| Date 日期时间 | DateTime DBM 代理| Delegator 摘要| Digest ...
When signing, Ruby SAML will use the first SP certificate in the sp_cert_multi[:signing] array. This will be the first active/non-expired certificate in the array if settings.security[:check_sp_cert_expiration] is true. The IdP may encrypt with any of the SP certificates in the sp_...
When accessing the first or last element from an array, prefer first or last over [0] or [-1]. Avoid mutable objects as hash keys. Use shorthand hash literal syntax when all keys are symbols. # bad { :a => 1, :b => 2 } # good { a: 1, b: 2 } Prefer hash rockets syntax...
For MongoDB, use a single field (of type Array) called coordinates (i.e., field :coordinates, type: Array). (See Advanced Model Configuration for using different attribute names.)3. In your model, tell geocoder where to find the object's address:geocoded_by :address...
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.[
This is a new C-API set to exchange a raw memory area, such as a numeric array and a bitmap image, between extension libraries. The extension libraries can share also the metadata of the memory area that consists of the shape, the element format, and so on. Using these kinds of metad...