How to write a function that accepts other functions as parameter

A function that can take another function as a parameter is referred to as a “higher-order function” in various programming languages.

Here is a JavaScript illustration:

function acceptFunc(func) {
return func();
} 

function sayHello() {
return "Hello!";
}
console.log(acceptFunc(sayHello)); // Output: "Hello!"

The acceptFunc function in the above example accepts the function func as a parameter.
The sayHello function is passed as an input when calling the acceptFunc function, and this function returns “Hello!” as the output of calling func.