The join Function in .NET Make pdf417 in .NET The join Function

5.4.5. The join Function use none none drawer toaccess none for none ISO QR Code standard The join fu none none nction joins the elements of an array into a single string and separates each element of the array with a given delimiter the opposite of split (see "The split Function" on page 110). It can be used after the split function has broken a string into array elements. The expression DELIMITER is the value of the delimiter that will separate the array elements.

The LIST consists of the array elements.. Format join(DELIMITER, LIST) Example 5.35. (The Script ) # Joining each elements of a list with colons 1 $name="Joe Blow"; $birth="11/12/86"; $address="10 Main St."; 2 print join(":", $name, $birth, $address ), "\n"; (Output) 2 Joe Blow:11/12/86:10 Main St..

Explanation 1. A string is assigned to a scalar. 2. The join none none function joins the three scalars, using a colon delimiter, and the new string is printed..

Example 5.36. (The Script none none ) # Joining each element of a list with a newline 1 @names=("Dan","Dee","Scotty","Liz","Tom"); 2 @names=join("\n", sort(@names)); 3 print @names,"\n"; (Output) 3 Dan Dee Liz Scotty Tom. Explanation 1. The array @names is assigned a list. 2. The join function will join each word in the list with a newline (\n) after the list has been sorted alphabetically..

3. The sorted list is printed with each element of the array on a line of its own. 5.4.6. The map Function The map fun none for none ction maps each of the values in an array to an expression or block, returning another array with the results of the mapping. This is easier to demonstrate in an example than to describe in words..

Format map EXPR, LIST; map {BLOCK} LIST; Example 5.37. (The Script ) # Mapping a list to an expression 1 @list=(0x53,0x77,0x65,0x64,0x65,0x6e,012); 2 @words = map chr, @list; 3 print @words; 4 @n = (2, 4, 6, 8); 5 @n = map $_ * 2 + 6, @n; 6 print "@n\n"; (Output) 3 Sweden 6 10 14 18 22. Explanation 1. The array @list consists of six hexadecimal numbers and one octal number. 2. The map none for none function maps each item in @list to its corresponding chr (character) value and returns a new list..

3. The new list is printed. Each numeric value was converted with the chr function to a character corresponding to its ASCII value.

. 4. The array @n consists of a list of integers. 5. The map function evaluates the expression for each element in the @n array and returns the new list to @n, resulting from the evaluation..

6. The results of the mapping are printed. Example 5.38. Code View: none for none (The Script) # Map using a block 1 open(FH, "datebook.master") or die; 2 @lines=<FH>; 3 @fields = map { split(":") } @lines; 4 foreach $field (@fields){ 5 print $field,"\n"; } (Output) 5 Sir Lancelot 837-835-8257 474 Camelot Boulevard, Bath, WY 28356 5/13/69 24500 Tommy Savage 408-724-0140 1222 Oxbow Court, Sunnyvale, CA 94087 5/19/66 34200 Yukio Takeshida 387-827-1095 13 Uno Lane, Asheville, NC 23556 7/1/29 57000 Vinh Tranh 438-910-7449 8235 Maple Street, Wilmington, VT 29085 9/23/63 68900. Explanation 1. The date none for none book.master file is opened for reading from the FH filehandle.

Each line consists of colonseparated fields terminated by a newline.. 2. The cont ents of the file are read and assigned to @lines. Each line of the file is an element of the array.

. 3. The map none none function uses the block format. The split function splits up the array at colons, resulting in a list where each field becomes an element of the array.

. 4. The foreach loop iterates through the array, assigning each element, in turn, to $field. 5. The disp none for none lay demonstrates the results of the mapping. Before mapping, the line was: Sir Lancelot:837835-8257:474 Camelot Boulevard, Bath, WY 28356:5/13/69:24500.

5.4.7. The pack and unpack Functions The pack an none none d unpack functions have a number of uses. These functions are used to pack a list into a binary structure and then expand the packed values back into a list. When working with files, you can use these functions to create uuencoded files, relational databases, and binary files.

The pack function converts a list into a scalar value that may be stored in machine memory. The TEMPLATE is used to specify the type of character and how many characters will be formatted. For example, the string c4, or cccc, packs a list into 4 unsigned characters, and a14 packs a list into a 14-byte ASCII string, null padded.

The unpack function converts a binary formatted string into a list, and puts a string back into Perl format.. Table 5.2. The Template pack and unpack Types and Values Template a A b B c C d f h H i I l L n N p P q Q s S u v V Description An ASCII string (null padded) An ASCII string (space padded) A bit string (low-to-high order, like vec) A bit string (high-to-low order) A signed char value An unsigned char value A double-precision float in the native format A single-precision float in the native format A hexadecimal string (low nybble first, to high) A hexadecimal string (high nybble first) A signed integer An unsigned integer A signed long value An unsigned long value A short in "network" (big-endian) order A long in "network" (big-endian) order A pointer to a null-terminated string A pointer to a structure (fixed-length string) A signed 64-bit value An unsigned 64-bit value A signed short value (16-bit) An unsigned short value (16-bit) A uuencoded string A short in "VAX" (little-endian) order A long in "VAX" (little-endian) order.

Template w x X @. Description A BER compressed unsigned integer in base 128, high bit first A null byte Back up a byte Null fill to absolute position.
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