#try catch

Dalam pemrograman, kesalahan atau error dapat terjadi karena berbagai hal, diantaranya error karena kesalahan sintaks, kesalahan logika, atau kesalahan input dari user. Kesalahan-kesalahan ini dapat menyebabkan program berhenti secara tidak terduga. Untuk mengatasi masalah ini, Java menyediakan mekanisme exceptions. Dalam tutorial kali ini kita akan bahas pengertian dan cara penanganan exceptions…

This is one of those functions that does something obvious, but encourages a better practice by making the operation take much less time. Firstly, here is some JSON parsing code without attempt:

var getHp = function(json) { var data = 'Not Found'; try { data = JSON.parse(json); } catch (e) {} if (data.hp) { return data.hp; } return 'Not Found'; }; console.log(getHp('{ "car": "miata", "hp": 150 }'));// 150 console.log(getHp('{}'));// Not Found console.log(getHp(''));// Not Found console.log(getHp({}));// Not Found

That is a simple approach, but when there is time pressure and so on in projects basic checks like the above tend to be ignored. So the solution is to make them so simple, that they become natural:

var getHp = function(json) { var data = attempt(JSON.parse.bind(this, json)); if (data.hp) { return data.hp; } return "Not Found"; }; console.log(getHp('{ "car": "miata", "hp": 150 }'));// 150 console.log(getHp('{}'));// Not Found console.log(getHp(''));// Not Found console.log(getHp({}));// Not Found

In the above example it is just slightly more code than using JSON.parse on its own. bind is a core JavaScript feature available in all modern browsers. The attempt function just abstracts the try and catch:

var attempt = function(callback) { try { return callback(); } catch (e) { return e; } };

This is available in various utility libaries like Lodash.

Implementing PowerShell Cleanup Code the Right Way

Your PowerShell code never does anything unexpected, right? Yea, mine doesn’t either, but I’m sure there are some of you out there with this problem. If so, this post is for you!

Have you ever had a time when your code generates some transient state? I’m talking about the code that generates temporary files, creates a temporary variable, opens a database connection for a limited time and so on?…

Try-Catch for Error Handling

Ever since SQL Server 2005, you have been able to use Try-Catch to trap and handle Transact-SQL errors. The obvious reasons to use this type of code is to trap errors in your T-SQL scripts and gracefully handle unexpected errors.

Here is a simple example of a Try-Catch block:

BEGIN TRY [Some SQL Statement] END TRY BEGIN CATCH [Error Handling or some other SQL Statement] END CATCH

The Tryblo…