Mastering Javascript Functions: A Beginner’S Guide To Creating Modular And Reusable Code

function

A relation that pairs each input with exactly one output

A function is a set of instructions or a block of code that performs a specific task or operation. It takes in some input values or arguments, performs operations on them, and then returns a result or output values. Functions can be created and used in various programming languages to increase code modularity and reuse.

In JavaScript, a function is defined using the keyword function followed by the function name, a set of parentheses containing the input parameters (if any), and then a block of code inside curly braces. Here is an example:

“`
function addNumbers(num1, num2) {
return num1 + num2;
}

console.log(addNumbers(2, 3)); // Output: 5
“`

In the above example, we defined a function called addNumbers that takes in two input parameters (num1 and num2), performs the addition operation inside the function body, and then returns the result using the return keyword. We can then call this function by passing in two values (2 and 3 in this case) and the console log will output the result of the addition operation (which is 5 in this case).

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