Menu
I am not sure how to call/frame this question title, but can anyone explain me what does the below code do?
var routes = require("./routes/routes.js")(app);
I am seeing a second () with app being passed, what does that do?
https://github.com/couchbaselabs/restful-angularjs-nodejs/blob/master/app.js
To my surprise, in the code above the variable routes is not at all used in app.js? what's the purpose. I am quite confused here does (app) argument do anything magic here?
654
A function in JavaScript is similar to a procedure—a set of statements that performs a task or calculates a value, but for a procedure to qualify as a function, it should take some input and return an output where there is some obvious relationship between the input and the output.
There are 3 ways of writing a function in JavaScript: Function Declaration. Function Expression. Arrow Function.
A function is declared using the function keyword. The basic rules of naming a function are similar to naming a variable. It is better to write a descriptive name for your function. For example, if a function is used to add two numbers, you could name the function add or addNumbers .
The construct
foo()();
expects that foo() returns a function and calls it immediately. It's equivalent to the more readable:
var func = foo();
func();
A similar construct you'll often see is:
(function() {
// function definition
})(args);
This defines a function and calls it immediately. The primary use is to emulate block scope for variables.
103
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
