Commands in Programming Languages: The EVAL command in JavaScript

In computer programming, command refers to an instruction to the computer to perform a specific task. Every program interacting with a human programmer responds to set of commands. The procedure of entering a set of commands and the syntax is called user interface. There are different forms of commands. For example, programmer inputs special keywords for the program to understand. The keywords work as commands. Another example of a command is the graphics object on the screen. A web page development expert adds various buttons or graphical objects on the screen for users to click on it, thus triggering an action.

The term command is specially used in imperative computer languages.  Programming languages like JavaScript use special commands. JavaScript is mainly designed for web pages that describe procedure and data in terms of methods, objects and properties unlike other languages which generally use statements, variables and routines. Many website development services use JavaScript as it enhances the interactive features and dynamics of web pages.

One of the most powerful commands in JavaScript is the EVAL command. Its uses are very powerful in web-based applications. The JavaScript EVAL command can be very powerful as it reduces code and creates an easy interaction with data. Custom web development programmers specializing in JavaScript know the true features of this command. The common syntax used is EVAL (“ string>”).

The EVAL command allows you to create and execute JavaScript dynamically. The main benefit of this command is that it reduces the number of lines in a block of code. Without it, developers find it very difficult to execute JavaScript.

With the EVAL command can work with data not known at load time (example: a user entered data). It takes any string provided by programmers and executes it by returning a result, if applicable. Programmers in websites development firm use this command in a variety of activities. For example, a list of field names can be reduced to a simple array and loop using the EVAL command.