Need to copy only a portion of array string to another array

Question

This is my source array:

my @raw_stack = (
    'a1~a2~a3~a4~a5',
    'b1~b2~b3~b4~b5',
    'c1~c2~c3~c4~c5',
    'd1~d2~d3~d4~d5',
    'e1~e2~e3~e4~e5',
);

I want get the 3rd value in '~' pattern then place that to another array.

The other array should now look like this:

my @other_stack = (
    'a3',
    'b3',
    'c3',
    'd3',
    'e3',
);

I could go about looping through the stack array then split
and push to another array, but i'm looking for a lean way
to code this.

Any ideas?

flesk · Accepted Answer · 2012-02-24 14:26:50Z

3

my @other_stack = map {(split/~/)[2]} @raw_stack;

edited Feb 24, 2012 at 14:26

answered Feb 24, 2012 at 9:43

flesk

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Comments

daxim · Accepted Answer · 2012-02-24 09:44:49Z

2

Use map to list transform instead of push. Use index/substr or unpack if the items are fixed-width. This generally is faster than split, which uses regex.

answered Feb 24, 2012 at 9:44

daxim

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3 Comments

Borodin Over a year ago

It is misguided to pursue efficiency before an obvious and clear solution has proven to be inadequate. Always go for readability and elegance before anything else.

daxim Over a year ago

If the OP asks an optimisation question, I take it on in good faith. How come you want to blame me?

Borodin Over a year ago

Ah I see. I didn't consider that lean may mean fast. I think it more likely that he wanted something more concise that the for / split / push approach that he imagined. I guess we'll never know.

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