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Perl | scalar keyword

  • Last Updated : 07 May, 2019

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



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