switch case done

perl/wiki

@@ -312,9 +312,184 @@
         @group2 : cef5 xcc360g cef8 cef4c
 
 
+-> Joining/Splitting the array elements
+
+        * Joining:
+            Syntax:
+            join("v", @array);
+
+            v: String which would be between the elements of array
+            #### join will return a string ####
+
+        * Splitting:
+            Syntax:
+            split("v", $string);
+
+            v: String which act a delimiter to split the give string
+            #### split will return array of strings ####
+
+        For ex:
+
+        @cards = qw(csc01 cef5 xcc369g);
+
+        print "============ Joining array elements to make string ==============";
+        $csvCards = join(",", @cards);
+        print "\$csvCards = $csvCards\n";
+        $dsvCards = join("--", @cards);
+        print "\$dsvCards = $dsvCards\n";
+
+        print "============ Splitting array elements to make array =============";
+        @s2aCards = split("--", $dsvCards);
+        print "\@s2aCards = @s2aCards\n";
+
 
 -> my keyword:
 
     my keyword is used in perl to limit the scope of variable
     to particular function or any scope where it is defined.
 
+
+-> Sorting and Merging:
+
+        * Sorting:
+            Syntax:
+            sort(@array);
+
+        * Merging:
+            Syntax:
+            (@array1,@array2);
+
+        For ex:
+        @cards = qw(csc01 cef5 xcc360g);
+
+        print "=========== Sorting & Merging ============";
+        @sortedCards = sort(@cards);
+        print "\@sortedCards = @sortedCards\n";
+        @futureCards = qw(cef9 csc03);
+        @presentNfutureCards = (@cards,@futureCards);
+        print "\@presentNfutureCards = @presentNfutureCards\n"
+
+        Output:
+
+        ========== Sorting & Merging ===========
+        @sortedCards = cef5 csc01 xcc360g
+        @presentnfutureCards = csc01 cef 5 xcc360g cef9 csc03
+
+-> HashMap:
+
+    Syntax:
+    @hashMap = ('key1', 'value1', 'key2', 'value2', 'key3', 'value3');
+
+    @hashMap = ('key1' => 'value1' , 'key2' => 'value2' , 'key3' => 'value3');
+
+    For ex:
+
+    print "========== HashMap ===========";
+
+    %cardG1CPUarch = ('csc01, 'mips', 'xcc360g', 'ppc', 'cef4c', 'ppc');
+    print "\$cardG1CPUarch{'csc01'} = $cardG1CPUarch{'csc01'}\n";
+    print "\$cardG1CPUarch{'xcc360g'} = $cardG1CPUarch{'xcc360g'}\n";
+    print "\$cardG1CPUarch{'cef4c'} = $cardG1CPUarch{'cef4c'}\n";
+
+    Output:
+
+    =========== HashMap ===========
+    $cardG1CPUarch{'csc01'} = mips
+    $cardG1CPUarch{'xcc360g'} = ppc
+    $cardG1CPUarch{'cef4c'} = ppc
+
+
+    print "========== HashMap ===========";
+
+    %cardG1CPUarch = ('csc01' => 'mips', 'xcc360g' => 'ppc', 'cef4c' => 'ppc');
+    print "\$cardG1CPUarch{'csc01'} = $cardG1CPUarch{'csc01'}\n";
+    print "\$cardG1CPUarch{'xcc360g'} = $cardG1CPUarch{'xcc360g'}\n";
+    print "\$cardG1CPUarch{'cef4c'} = $cardG1CPUarch{'cef4c'}\n";
+
+    Output:
+
+    =========== HashMap ===========
+    $cardG1CPUarch{'csc01'} = mips
+    $cardG1CPUarch{'xcc360g'} = ppc
+    $cardG1CPUarch{'cef4c'} = ppc
+
+
+-> Slicing HashMap, Key - Values - Size of hashmap, Adding/Removing from Hashmap
+
+    Ex:
+    %cardG1CPUarch = ('csc01', 'mips', 'xcc360g', 'ppc', 'cef4c', 'ppe');
+
+    print "=============Slicing Hashes================";
+    @cpuSlice1 = @cardG1CPUarch('csc01', 'cef4c');
+    print "\@cpuSlice1 = @cpuSlice1\n";
+    
+    print "=============Keys & Values & size of hash=============\n"
+    @g1Cards = keys @cardG1CPUarch;
+    print "\@g1Cards = @g1Cards\n";
+    @g1CPU = values %cardG1CPUarch;
+    print "\@g1CPU = @g1CPU\n"
+    #everything true for arrays can be used for ex:
+    print "\@g1CPU[2] = @g1CPU[2]\n";
+    $g1HashSize = @g1Cards;  #donwgrading the array to scalar.
+    print "\$g1HashSize = $g1HashSize\n";
+
+    print "===============Adding or removing elements================\n";
+    $cardG1CPUarch{'PCsim"} = 'i386';
+    @g1Cards = keys %cardG1CPUarch;
+    print "\@g1Cards = @g1Cards\n";
+    @g1CPU = values %cardG1CPUarch;
+    print "\@g1CPU = @g1CPU\n".\;
+    print "removing cef4c from %cardG1CPUarch\n\n";
+    delete $cardG1CPUarch{'cef4c'};
+    @g1Cards = keys %cardG1CPUarch;
+    print "\@g1Cards = @g1Cards\n";
+    @g1CPU = values %cardG1CPUarch;
+    print "\@g1CPU = @g1CPU\n";
+    
+
+    print "====================HashMap end========================"
+
+
+-> Ternary operator in perl
+    
+    For Ex:
+    $isSimulator = ($cardG1CPUarch{'PCsim'} == 'i386') ? "Yes" : "No";
+
+    print "  \$isSimulator - $isSimulator\n";
+
+-> Branching in Perl (if-else):
+
+    For ex:
+
+    $a = 20;
+    unless( $a == 30 ){
+        #if condition is false then print the following
+        printf "a has a value which is not 20\n"
+    }
+    elseif( $a == 30 ){
+        #if condition is true then print the following
+        printf "a has a value which is 30\n";
+    }
+    else{
+        #if none of the above condition is met
+        printf "a has a value which is $a\n";
+    }
+
+-> switch in Perl (switch case):
+    #switch with fall thru.
+    #need Switch to be installed on system using cpan
+    
+    For ex:
+    use Switch;
+    @array = (10, 20, 30);
+    %hash = ('key1' => 10, 'key2' => 20);
+
+    switch($a){
+        case 10         { print "number 100\n"; next; }
+        case "a"        { print "string a" }
+        case (\@array)  { print "number in list" }
+        case (\%hash)   { print "entry in hash" }
+        else            { print "previous case not true"} 
+    }
+
+