使用mojo进行get的问题请教

rubyish

1: wo budong mojo
2: line 32, you do nothing

1.         @arr =  (map { if (m#attachments/download#) { 'http://192.168.1.1'.$_."\n";$_} } @$array);

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3: try kankan

1. my @arr =
   
2.   map { m#attachments/download# ? 'http://192.168.1.1' . $_ . "\n" : () }
   
3.   @$array;

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rubyish

1. my @a = qw/1 a 2 b/;
   
2. my @b;
   
3. 
   
4. for (@a) {
   
5.     push @b, 'hello' . $_ if /\d/;
   
6. }
   
7. say join '|', @b;    # hello1|hello2
   
8. say scalar @b;       # 2
   
9. 
   
10. my @c = map { /\d/ ? 'hello' . $_ : () } @a;
    
11. say join '|', @c;    # hello1|hello2
    
12. say scalar @c;       # 2
    
13. 
    
14. my @d = map { 'hello' . $_ if /\d/ } @a;
    
15. say join '|', @d;    # hello1||hello2|
    
16. say scalar @d;       # 4
    
17. 
    
18. 
    
19. # Useless use of concatenation (.) or string in void context
    
20. my @e = map { if (/\d/) { 'hello' . $_; $_ } } @a;
    
21. say join '|', @e;   # 1||2|
    
22. say scalar @e;      # 4

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