Ruby中的字符串可变吗? [英] Are strings in Ruby mutable?

问题描述

考虑以下代码:

$ irb
> s = "asd"
> s.object_id   # prints 2171223360
> s[0] = ?z     # s is now "zsd"
> s.object_id   # prints 2171223360 (same as before)
> s += "hello"  # s is now "zsdhello"
> s.object_id   # prints 2171224560 (now it's different)

似乎无需创建新字符串即可更改单个字符.但是，在字符串后面附加显然会创建一个新字符串.

Seems like individual characters can be changed w/o creating a new string. However appending to the string apparently creates a new string.

Ruby中的字符串可变吗?

推荐答案

是的，与Python不同，Ruby中的字符串是可变的.

Yes, strings in Ruby, unlike in Python, are mutable.

s += "hello"不是不，将"hello"附加到s-创建了一个全新的字符串对象.要附加到字符串就地"，请使用<<，例如:

s += "hello" is not appending "hello" to s - an entirely new string object gets created. To append to a string 'in place', use <<, like in:

s = "hello"
s << "   world"
s # hello world

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