JavaScript Functions and Variables

Every programming language uses functions and variables to improve interaction with users. Functions help in providing additional actions in the application while variables interact with data so that the right information could be extracted as soon as possible. If the developer is able to harness the power of different functions and variables related to the programming language, the application will surely become a success.

Unfortunately, there is no universal interpretation of variables and functions. Developers have to understand their functions in each programming language so they could properly execute the code.

In JavaScript, functions and variables do not have the same interpretation. This difference is usually found in browsers wherein it actively interacts with JavaScript. Whenever a developer builds an Ajax based application, JavaScript uses functions and variables that are later read by the browser. If they are used correctly, the result could even be better than expected.

Functions and variables use two stages of implementation: the declaration (or tag) and the coding. Functions and variables do not interpret these stages in the same way.

Stages in Variables

Variables are considered part of the data wherein it interacts with the targeted data to provide the desired output. In implementing variables, developers have to create a declaration first and point the code to the said declaration. This is the same with functions, however; variables have to follow the order of loading as they are coded. Before the code could be executed, the tag has to be fully loaded first before the code could perform its function. The logic behind this is that the browser has to know the data it interacts with before execution. If the code will load up before the declaration, then the data would be undefined and will not work as expected.

Stages in Functions

As already indicated, the coding in functions is the same with variables – the declaration goes first and the code with the declaration is written after the declaration. But this is where the similarity ends. The browser does not wait for the full declaration to be loaded. The browser will just execute the function without even waiting for the declaration since the code is already written with the declaration. But developers have to expect that the function will not work as fast as those that come with the declaration since the ease of interpretation is clearly there compared to longer coding.

Small Exceptions on Functions

While the necessity of declaration is no longer applied to function sounds good, there are limitations. This rule is only applied to functions in relation to declaration. If the developer creates functions with expressions, the declaration has to be fully loaded first so that it could effectively work with expressions. This setting is not also available in many frameworks since they will implement everything for easier interaction. Creating shortcuts for your function could be done by manually coding.

Functions and variables could be easily harnessed as long as you know how they are interpreted by browsers. Although their application is limited, they could ease development and speed up processing in the browser.