Re: Can you set a character in a string at a given index directly?

[blindluke]

Yes, you can. Read the documentation for the substr function.

UPDATE: a simple example

#!/usr/bin/perl
use v5.14;

my $string = '0123456789';
my $index  = 1;             # second character
my $replacement = 'x';

substr( 
    $string,
    $index,         # starting from 0
    1,              # how many characters
    $replacement,
);

say $string;        # will print out '0x23456789' as expected

[tkguifan]

This one I like. I mean the example. I could not figure this out that quickly even reading the documentation. I have always thougt that substr returns something. I never thought of it as something that can set something :).

[MidLifeXis]

The return value of substr is an lvalue (assuming the original string is an lvalue), which is a fancy way of saying that it can be assigned to. So, the chunk of the data returned by substr can be assigned to. The four argument version of this call is (basically) equivalent.

substr( 
    $string,
    $index,         # starting from 0
    1,              # how many characters
) = $replacement;