Perl | scalar keyword
scalar keyword in Perl is used to convert the expression to scalar context. This is a forceful evaluation of expression to scalar context even if it works well in list context.
Syntax: scalar expr
Returns: a scalar value
Example 1:
#!/usr/bin/perl -w # Defining Arrays @array1 = ("Geeks", "For", "Geeks"); @array2 = (1, 1, 0, 0, 9, 6); # Concatenation of both arrays @array3 = (@array1, @array2); # Printing the Concatenated Array # in List form print "Array in List form: @array3\n"; # Conversion of Arrays to scalar context @array3 = (scalar(@array1), scalar(@array2)); # Conversion to scalar returns # the number of elements in the array print "Array in scalar form: @array3\n"; |
Output:
Array in List form: Geeks For Geeks 1 1 0 0 9 6 Array in scalar form: 3 6
Example 2:
#!/usr/bin/perl -w # Defining Arrays @array1 = ("Welcome", "To", "Geeks"); @array2 = (1, 1, 0, 0, 9, 6); # Concatnation of both arrays @array3 = ( @array1, @array2 ); # Printing the Concatenated Array print "Concatenation of Arrays: @array3\n"; # Conversion of Arrays to scalar context to # Evaluate Difference between size of arrays @array3 = (scalar(@array2) - scalar(@array1)); # Printing the size Difference print "Difference in number of elements: @array3\n"; |
Output:
Concatenation of Arrays: Welcome To Geeks 1 1 0 0 9 6 Difference in number of elements: 3
