Perl | reset() Function
reset() function in Perl resets (clears) all package variables starting with the letter range specified by value passed to it. Generally it is used only within a continue block or at the end of a loop.
Note: Use of reset() function is limited to variables which are not defined using my() function.
Syntax: reset(letter_range)
Parameter:
letter_range: a range of letters that begin with a common character or a set of charactersReturns:
1, and resets all the variable in the given range
Example 1:
#!/usr/bin/perl -w $var1 = 20; $var2 = 15; # Values before reset() function call print "var1 value = $var1, " , "var2 value = $var2\n" ; # Now reset all variables whose # name starts with 'v' reset ( 'v' ); # Values after reset() function call print "var1 value = $var1, " , "var2 value = $var2\n" ; |
Output:
var1 value = 20, var2 value = 15 var1 value = , var2 value =
Example 2:
#!/usr/bin/perl -w $variable1 = 10; $variable2 = 30; # defining private variable using my() my $variable3 = 40; # Values before reset() function call print "variable1 value = $variable1, " , " variable2 value = $variable2\n" ; print "variable3 value = $variable3\n" ; # Now reset all variables whose # name starts with 'v' reset ( 'v' ); # Values after reset() function call print "variable1 value = $variable1, " , " variable2 value = $variable2, \n" ; print "variable3 value = $variable3" ; |
Output:
variable1 value = 10, variable2 value = 30 variable3 value = 40 variable1 value = , variable2 value = , variable3 value = 40
In the code given in Example 2, variable 3 is defined using my() function and hence, its value shows no effect of the reset() function whereas other variable’s values get reset.