为什么 Ruby 解包有时会返回一个数组，但有时会返回值？

Question

In the code below I use unpack() to ready some bytes from a string:

  # unpack two bytes
  byte1, byte2 = "ABCDEFG".unpack("CC")
  # unpack one byte
  byte3 = "ABCDEFG".unpack("C")

When I hover over byte1 I see 65 , when I hover over byte2 I see 66 , but when I hover over byte3 I see [0] = 65 . Why is this?

Answer 1

In the first example you're destructuring the returned array.

In the second example you're not.

unpack always returns an array (as described in the docs) but what you do with that array will affect what's displayed in your editor/IDE. In the second example you're setting a single value to the return value of unpack , the array.