Query collections

Simplicity is the ultimate sophistication, and with over 40 methods in 4D v16 R6 to manage collections, things are getting much easier for you as a developer. Not only is your code clean and more readable, but its also written in record time!

In this blog post we’ll take a look at how the two new methods, query and indices, will allow you to manipulate and retrieve items from a collection in a snap!


Find a specific attribute value in a single line of code!

Remember the days when you had to use nested loops and conditional statements to retrieve an object’s attribute? So you ended up with a long and complicated piece of code? Well, those days are over! Thanks to object notation combined with collections and their methods, you’re now able to write code faster, and in a more readable way!

Finding a specific attribute’s value has never been easier. Let’s take a look at a real life scenario and discover how!


Calculations in collections

Calculate average, total or price (including tax) are common tasks in any business application. Collections are an easy way to aggregate your data in a consistent way. With it, this type of calculation becomes very simple, because there are collection methods that do everything for you!


Convert collections

4D v16 R6 provides advanced capabilities to manipulate collections, thanks to 40+ methods to be used with Object Notation. By using them, you’ll be able to write your code in a more efficient way. New code is great, but we also kept in mind that this new code needs to easily integrate with your existing code. This is why we’ve introduced dedicated commands to convert collections to arrays or strings, and vice-versa.


Insert or remove elements from a collection

Adding and/or removing elements to and from collections are common programming tasks that developers often encounter. 4D v16 R6 provides over 40 collection methods, including methods specifically dedicated to the addition and removal of elements in a collection. With these methods, you can easily create a stack (FIFO) or queue (LIFO), add new elements at any position, and much more…


A wide range of possibilities to manage your collections

4D v16 R6 provides advanced capabilities to manipulate collections, thanks to a series of methods to be used with Object Notation. Over 40 methods are now available, which allow, for example, the ability to add or remove elements in a collection, sort it, search the elements in it and much more! There are so many new possibilities that it is impossible to present them in a single post. This post is the first of a series you don’t want to miss…


4D initiates a new variable type: Collection

4D v16 R4 introduces a new type of variable called Collection. What are these variables intended for? Like Objects or BLOBs, collections can be used to hold almost any kind of variable types like texts, numerics, booleans, objects and even other collections. The good thing is that, all these variables types previously mentioned can be mixed inside the same collection, where arrays must always contain the same type of elements!