By Brandon Atkinson
CoffeeScript software improvement provides you with an in-depth examine the CoffeeScript language, all whereas development a operating net program. alongside the way in which, you'll see the entire nice beneficial properties CoffeeScript has to provide, and how one can use them to house genuine difficulties like sprawling codebases, incomplete facts, and asynchronous internet requests.
Through the process this publication you'll study the CoffeeScript syntax and notice it confirmed with basic examples. As you pass, you'll positioned your new talents into perform by means of development an internet software, piece through piece. You'll commence with general language beneficial properties comparable to loops, features, and string manipulation. Then, we’ll delve into complex gains like sessions and inheritance. examine complicated idioms to house universal occurrences like exterior internet requests, and hone your approach for improvement initiatives like debugging and refactoring.
CoffeeScript software improvement will train you not just the right way to write CoffeeScript, but additionally the best way to construct strong purposes that run easily and are a excitement to take care of.
Tips on how to construct impressive and complicated reactive net purposes simply with Vue. jsAbout This BookLearn tips to propagate DOM adjustments around the site with no writing large jQuery callbacks code. find out how to in achieving reactivity and simply compose perspectives with Vue. js and comprehend what it does backstage.
- NW.js Essentials
The COUNT function in SQL is optimized internally and doesn't have to iterate through each data element to get the count. Whenever you can, use COUNT; it can definitely make a difference in program-execution speed. Also, consider this: if you use a counter for the preceding program, you have to keep track of each publisher somehow, incrementing the counter for that publisher only. If you have books from 100 publishers, your code will get pretty unmanageable! Other DBI Data-Retrieval Functions Now that we have covered the basics of fetching data from a database table using the Perl DBI, we'll cover some alternative ways in Perl to fetch the data.
If there is one nonword character, or 100 nonword characters at the beginning of the line, this expression will get rid of all of them. • // at the end is what we are substituting any matched characters with-nothing. This expression removes any nonword characters from the beginning of the string. Line 19 is another regular expression. This time, the regular expression is looking for carriage-return characters or linefeed characters. \015 is the octal value for a carriage return, and \012 is the octal value for a linefeed.
Fetchrow_hashref The fetchrow_hashref method of data access is one of the best. Instead of having to deal with arrays and array indexing, you can access the data via a hash; the keys of the hash are the field names of the data. pl 04: # Chapter 4 05: # Listing 4-8 06: # 07: use strict; 08: use DBI; 09: my $dbh = DBI->connect ("DBI:mysql:BibleBook","bookuser","testpass") 10: or die("Cannot connect: $DBI::errstr"); 11: my $sql = qq(SELECT * FROM library); 12: my $sth = $dbh->prepare($sql); 13: $sth->execute; This program is also quite similar to the others we've worked with so far, but we have made a few changes because we are using the fetchrow_hashref function.