File: f_map

package info (click to toggle)
perl 5.8.8-7etch6
  • links: PTS
  • area: main
  • in suites: etch
  • size: 60,396 kB
  • ctags: 33,629
  • sloc: perl: 199,713; ansic: 160,511; sh: 33,095; pascal: 8,270; lisp: 6,121; makefile: 2,373; cpp: 2,035; yacc: 1,047; java: 23
file content (29 lines) | stat: -rw-r--r-- 707 bytes parent folder | download | duplicates (14) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
 
#!perl
# examples shamelessly snatched from perldoc -f map

# translates a list of numbers to the corresponding characters.
@chars = map(chr, @nums);

%hash = map { getkey($_) => $_ } @array;

{
    %hash = ();
    foreach $_ (@array) {
	$hash{getkey($_)} = $_;
    }
}

#%hash = map {  "\L$_", 1  } @array;  # perl guesses EXPR.  wrong
%hash = map { +"\L$_", 1  } @array;  # perl guesses BLOCK. right

%hash = map { ("\L$_", 1) } @array;  # this also works

%hash = map {  lc($_), 1  } @array;  # as does this.

%hash = map +( lc($_), 1 ), @array;  # this is EXPR and works!

%hash = map  ( lc($_), 1 ), @array;  # evaluates to (1, @array)

@hashes = map +{ lc($_), 1 }, @array # EXPR, so needs , at end