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Home: Perl Programming Help: Frequently Asked Questions:
How do I process/modify each element of an array?

Jasmine
Administrator

Jan 19, 2001, 3:15 PM

Post #1 of 1 (1066 views)

How do I process/modify each element of an array?	Can't Post

(From the Perl FAQ)

How do I process/modify each element of an array?

Use for/foreach:

Code

    for (@lines) { 
        s/foo/bar/;     # change that word 
        y/XZ/ZX/;       # swap those letters 
    }

Here's another; let's compute spherical volumes:

Code

    for (@volumes = @radii) {   # @volumes has changed parts 
        $_ **= 3; 
        $_ *= (4/3) * 3.14159;  # this will be constant folded 
    }

If you want to do the same thing to modify the values of the hash, you may not use the values function, oddly enough. You need a slice:

Code

    for $orbit ( @orbits{keys %orbits} ) { 
        ($orbit **= 3) *= (4/3) * 3.14159;  
    }

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