This question already has an answer here:
这个问题已经有了答案:
- What is the easiest way to push an element to the beginning of the array? 5 answers
- 将元素推到数组开头的最简单方法是什么?5个回答
What is the best way to prepend to an array in Ruby. Perhaps something similar to Python's list.insert(0, 'foo')?
在Ruby中预置数组的最好方法是什么。也许类似于Python的列表。插入(0,“foo”)?
I'd like to be able to add an element to a Ruby array at the 0 position and have all other elements shifted along.
我希望能够将一个元素添加到一个位于0位置的Ruby数组中，并让所有其他元素沿着这条线移动。
3 个解决方案
#1
54
array = ['b', 'c']
array.unshift('a')
p array
=> ['a', 'b', 'c']
#2
4
Another way than Steve's answer
另一种方法比史蒂夫的回答更有效
array = ['b', 'c']
array = ['a'] + array #["a", "b", "c"]
#3
3
array = ["b", "c"]
array.insert(0, "a", "a") # => ["a", "a", "b", "c"]
#1
54
array = ['b', 'c']
array.unshift('a')
p array
=> ['a', 'b', 'c']
#2
4
Another way than Steve's answer
另一种方法比史蒂夫的回答更有效
array = ['b', 'c']
array = ['a'] + array #["a", "b", "c"]
#3
3
array = ["b", "c"]
array.insert(0, "a", "a") # => ["a", "a", "b", "c"]