React Js Series for Beginners தமிழில் 21 : Javascript Functions | How to Declare a Function ?

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A function in JavaScript is a set of instructions that do a specific job. You create a function to make your code easier to organise and reuse. Instead of writing the same code over and over, you just call the function whenever you need it. This makes your code cleaner and easier to manage.

Function declaration is when you create a function. You use the function keyword, give your function a name, and then add parentheses (). Inside the curly braces {}, you write the code that the function will run. This is how you set up or declare a function.

Function calling is when you make the function run its code. To call a function, you simply type its name and add parentheses (). When you call the function, it runs the code inside it and does its job.

Function parameters and arguments let you give information to a function. When you declare a function, you can add parameters in the parentheses (). Later, when you call the function, you provide arguments—the actual values that take the place of the parameters. Parameters are like placeholders, and arguments are the real data you send to the function.

In short, a function in JavaScript is a tool to do a task. You declare it to create it, call it to run it, and use parameters and arguments to pass i

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🕘Timestamps:
00:15 - what is Function
01:40 - Function Declaration & Function Call
04:15 - Function Parameter
06:15 - Function Argument
09:40 - Conditional Statement inside Function


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