Explain JavaScript function with syntax.

Answer

It is a block of code and is designed to perform a particular tasks. It is executed when "something" invokes it(calls it).

It is defined with the function keywords,paranthesis(),and name.

Syntax- function name (parameter1, parameter2, parameter3) {
                         // code to be executed
                }

Why  to use Functions in JavaScript?

You can reuse code: Define the code once, and use it many times.

You can use the same code many times with different arguments, to produce different results.

Examples- function toCelsius (fahrenheit) {
                   return (5/9) * (fahrenheit-32);
                 }
document.getElementById("check").innerHTML = toCelsius(77);