Ruby临时变量赋值和修改

Question

我有一个像“帽子”这样的词，我想造一个完全一样的新词，但最后一个字母不同。

word = "hat"
temp = word
temp[temp.length-1] = "d"

puts "temp is #{temp}"
puts "word is #{word}"

# Output:
# temp is had
# word is had

我现在希望 temp = "had" 和 word = "hat" 但这两个词都改成了 had！

我有一种预感，这可能与两个变量都指向内存中的同一位置有关？

为什么会发生这种情况，如何保持这两个值？

Answer 1

为什么会这样

你一定要读这个Is Ruby pass by reference or by value?

如何保持这两个值？

使用dup。它复制了object

word = "hat"
temp = word.dup
temp[temp.length-1] = "d"

puts "temp is #{temp}"
puts "word is #{word}"

# Output:
# temp is had
# word is hat