JavaScript Functions

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JavaScript functions are blocks of code that can be defined and executed at a later time. They are a fundamental part of JavaScript programming and allow for the creation of reusable code that can be used multiple times in a program.

Functions in JavaScript can be defined using the “function” keyword, followed by the name of the function and a set of parentheses that may contain parameters. The body of the function is enclosed in curly braces {}.

Here’s an example of a basic JavaScript function that takes two parameters and returns their sum:

function sum(a, b) {
  return a + b;

To call a function, you simply use its name followed by a set of parentheses containing any arguments you want to pass to the function. Here’s an example:

let result = sum(2, 3); // result will be 5

Functions can also be assigned to variables or passed as arguments to other functions. Here’s an example of assigning a function to a variable:

let multiply = function(a, b) {
  return a * b;

And here’s an example of passing a function as an argument to another function:

function applyOperation(a, b, operation) {
  return operation(a, b);

let result = applyOperation(2, 3, multiply); // result will be 6

JavaScript also supports arrow functions, which provide a more concise syntax for defining functions. Here’s an example of an arrow function that takes a single parameter and returns its square:

let square = x => x * x;

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