从哈希中删除键值对 (RUBY)
Deleting a key-value pair from hash (RUBY)
movies = {
StarWars: 4.8,
Divergent: 4.7
}
print movies
这段代码returns一个散列:
{:StarWars=>4.8, :Divergent=>4.7}
当我尝试删除键值对并再次打印电影时:
movies = {
StarWars: 4.8,
Divergent: 4.7
}
movies = movies.delete("Divergent".to_sym)
print movies
我得到:
4.7
如何删除键值对,以便在我要求打印电影散列的内容后得到:
{:StarWars=>4.8}
Hash#delete returns 提供的键的值 movies.delete("Divergent".to_sym)
returns 4.7
,然后将其重新分配给 movies
,现在 movies
是 4.7
.
所以你可以 delete
而不是重新分配:
movies.delete("Divergent".to_sym)
print movies # => {:StarWars=>4.8}
movies = {
StarWars: 4.8,
Divergent: 4.7
}
print movies
这段代码returns一个散列:
{:StarWars=>4.8, :Divergent=>4.7}
当我尝试删除键值对并再次打印电影时:
movies = {
StarWars: 4.8,
Divergent: 4.7
}
movies = movies.delete("Divergent".to_sym)
print movies
我得到:
4.7
如何删除键值对,以便在我要求打印电影散列的内容后得到:
{:StarWars=>4.8}
Hash#delete returns 提供的键的值 movies.delete("Divergent".to_sym)
returns 4.7
,然后将其重新分配给 movies
,现在 movies
是 4.7
.
所以你可以 delete
而不是重新分配:
movies.delete("Divergent".to_sym)
print movies # => {:StarWars=>4.8}