Question

我正在尝试将哈希插入到数组中，遵循以下示例：How to make dynamic multi-dimensional array in ruby?。出了什么问题？

@array = Array.new
test1 = {"key1" => "value1"}
test2 = {"key2" => "value2"}
test3 = {"key3" => "value3"}            
@array.push(0)
@array[0] << test1
# ERROR: can't convert Hash into Integer    
@array[0] << test2    
@array.push(1)
@array[1] << test2
@array[1] << test3

Answer 1

<<附加到数组，与push相同，所以只需执行：

@array << test1

或者，如果您想覆盖特定元素，请说0：

@array[0] = test1

或者你真的想要一个二维数组，例如@array[0][0]["key1"] == "value1"？在这种情况下，您需要在尝试追加它们之前将空数组插入正确的位置：

@array[0] = []
@array[0] << test1
@array[0] << test2    
@array[1] = []
@array[1] << test2
@array[1] << test3

Answer 2

有许多方法可以插入Ruby数组对象。这是一些方法。

1.9.3p194 :006 > array = []
 => [] 
1.9.3p194 :007 > array << "a"
 => ["a"] 
1.9.3p194 :008 > array[1] = "b"
 => "b" 
1.9.3p194 :009 > array.push("c")
 => ["a", "b", "c"] 
1.9.3p194 :010 > array_2 = ["d"]
 => ["d"] 
1.9.3p194 :011 > array = array + array_2
 => ["a", "b", "c", "d"] 
1.9.3p194 :012 > array_3 = ["e"]
 => ["e"] 
1.9.3p194 :013 > array.concat(array_3)
 => ["a", "b", "c", "d", "e"] 
1.9.3p194 :014 > array.insert("f")
 => ["a", "b", "c", "d", "e"] 
1.9.3p194 :015 > array.insert(-1,"f")
 => ["a", "b", "c", "d", "e", "f"]

Answer 3

此上下文中的

@array[0] << test1表示0 << { "key1" => "value1" }，这是尝试通过哈希进行位移0。 Ruby无法将哈希值转换为整数以实现此目的，这就是您收到该错误消息的原因。

Ruby：将哈希插入数组？

3 个答案: