Ruby - can't modify frozen string (TypeError)

Question

Got ... '[]=': can't modify frozen string (TypeError) when trying to modify what I thought was a copy of ARGV[0]. Same results for each of ``` arg = ARGV[ 0 ] arg_cloned = ARGV[ 0 ].clone arg_to_s = ARGV[ 0 ].to_s arg[ 'x' ] = 'y' arg_cloned[ 'x' ] = 'y' arg_to_s[ 'x' ] = 'y' ```

Accepted Answer

since google took too long to find the right answer ...

needed to do

```
arg_dup = ARGV[ 0 ].dup
```

Ruby - can't modify frozen string (TypeError)

Solution

Problem