如何防止数组串联更改所涉及数组的值？
How do I prevent array concatenation from changing the values of the arrays involved?
我想创建一些数组值常量，但在尝试连接它们时似乎遇到了问题。
MALE_TOKENS = %w(m male)
#=> ["m", "male"]
FEMALE_TOKENS = %w(f w female)
#=> ["f", "w", "female"]
GENDER_TOKENS = MALE_TOKENS.concat FEMALE_TOKENS
#=> ["m", "male", "f", "w", "female"]
MALE_TOKENS
#=> ["m", "male", "f", "w", "female"]
请注意，在 concat 生成之后，MALE_TOKENS 现在包含 FEMALE_TOKENS。我不要这个。
如何将物品分开？
Array#concat 改变接收者：
Appends the elements of +other_ary+s to self.
要不更改 MALE_TOKENS 值，您可以使用 Array#+:
GENDER_TOKENS = MALE_TOKENS + FEMALE_TOKENS
#=> ["m", "male", "f", "w", "female"]
MALE_TOKENS
#=> ["m", "male"]
FEMALE_TOKENS
#=> ["f", "w", "female"]
我想创建一些数组值常量，但在尝试连接它们时似乎遇到了问题。
MALE_TOKENS = %w(m male)
#=> ["m", "male"]
FEMALE_TOKENS = %w(f w female)
#=> ["f", "w", "female"]
GENDER_TOKENS = MALE_TOKENS.concat FEMALE_TOKENS
#=> ["m", "male", "f", "w", "female"]
MALE_TOKENS
#=> ["m", "male", "f", "w", "female"]
请注意，在 concat 生成之后，MALE_TOKENS 现在包含 FEMALE_TOKENS。我不要这个。
如何将物品分开？
Array#concat 改变接收者：
Appends the elements of +other_ary+s to
self.
要不更改 MALE_TOKENS 值，您可以使用 Array#+:
GENDER_TOKENS = MALE_TOKENS + FEMALE_TOKENS
#=> ["m", "male", "f", "w", "female"]
MALE_TOKENS
#=> ["m", "male"]
FEMALE_TOKENS
#=> ["f", "w", "female"]