As a Coder or Programmer, you have been using Function to solve small problems and return resultant values.
But, have you ever thought – when do Programmers declare a Function ?
In other words, you wanted to know the importance of Function Declaration at a certain level while you are programming.
In this article, we will be discussing – when do we need to declare a Function ?
But, before we proceed to dive deep into the subject matter, you need to understand how Functions in Programming work.
Also, you need to understand about the process of Function Declaration.
Note: You can also jump to the specific section if you need to skip the additional details.
What is meant by a Function ?
Functions are used in Programming languages. It’s sole purpose is to write and organise code structure(s) for a specific Task.
For example, a collection of code syntax’s of 100 lines does a specific job and return a resultant value.
Another example, a Code Snippet That performs multiplication of 5 user input numbers and returns the result.
Functions are used for improved performance in programming. For example, once you have written a Function for a specific Task, you don’t need to repeat code snippet for the same Task.
In this case, you will need to recall or mention the Function name or catch the returning resultant value.
Functions are named with different names in various programming languages. For example, to name a few, Procedures, Methods, or Routines are the second names of a Function in different programming languages.
Although the names are different, the main functionality of Functions are identical in nature.
What is Function Declaration ?
In simple words, Function Declaration refers to creating a Function from scratch.
Function Declaration consists of several key points, including the name of the newly created Function, return Type, and parameters.
The function declaration syntax contains all the above points. Once the parameters are supplied correctly, the Compiler proceeds to create a new Function with the Title Name supplied.
When do Programmers declare a Function ?
Programmers declare a Function when they need to perform a single Task repeatedly. In this case, a Function helps programmers get Things done faster, without repeating the same lines of code over and over again.
Function Declaration also becomes mandatory when a single Function is subjected to be called across different source files. In this case, programmers often need to recall or define Functions separately, if there is no other routine in place for the purpose.
In other words, Programmers need to declare Functions when they need to obtain resultant value from a set of coding instructions.
In this case, once a Function creates a resultant value out of processing, the developers can catch or call That value by mentioning the Function name in source code, instead of writing the same code again.
As discussed above, Functions also serve code repetition without actually writing the code multiple Times. This plays important role while struggling to solve a software Bug.
Functions also break down big projects into small, easy to manage source codes. In this case, each code snippet performs a specific Task, thus contributing to solving the big picture in an easy to use manner.
Programmers declare a Function when they need to perform specific Tasks without repeating code snippets.
This is not the only reason to create Functions. There are of course, many reasons of why Programmers need to create or declare Functions.
Above, we addresses many ways to why programmers actually declare Functions. You can dive deep into the matter for each reason, if you wanted to explore a little bit more.
Note: We have put together factually correct information on why would programmers need to declare Functions. If you have found something objection-able or want to contact for suggestions, please join the conversation in the comments.