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Values

It's easy to think that function would be a top-level built-in type in JS, especially given this behavior of the typeof operator. However, if you read the spec, you'll see it's actually a "subtype" of object. Specifically, a function is referred to as a "callable object" -- an object that has an internal [[Call]] property that allows it to be invoked.

The fact that functions are actually objects is quite useful. Most importantly, they can have properties. For example:

function a(b,c) {
	/* .. */
}

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Routing in Express

Routing refers to how an application’s endpoints (URIs) respond to client requests. For an introduction to routing, see Basic routing.

You define routing using methods of the Express app object that correspond to HTTP methods; for example, app.get() to handle GET requests and app.post to handle POST requests. For a full list, see app.METHOD. You can also use app.all() to handle all HTTP methods and app.use() to specify middleware as the callback function (See Using middleware for details).

These routing methods specify a callback function (sometimes called “handler functions”) called when the application receives a request to the specified route (endpoint) and HTTP method. In other words, the application “listens” for requests that match the specified route(s) and method(s), and when it detects a match, it calls the specified callback function.

In fact, the routing methods can have more than one callback function as arguments. With multiple callback functions, it is important to provid

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Note: Many developers believe there should never be any variables in the global namespace, and that everything should be contained in modules and private/separate namespaces. This is great in theory but nearly impossible in practicality; still it's a good goal to strive toward! Fortunately, ES6 added first-class support for modules, which will eventually make that much more practical.

As a simple example, imagine having a "debug mode" in your program that is controlled by a global variable (flag) called DEBUG. You'd want to check if that variable was declared before performing a debug task like logging a message to the console. A top-level global var DEBUG = true declaration would only be included in a "debug.js" file, which you only load into the browser when you're in development/testing, but not in production.

However, you have to take care in how you check for the global DEBUG variable in the rest of your application code, so that you don't throw a ReferenceError. The safety guard on typeof is our frien

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Diffing

first off there's no first class concept in vue of "navigating" to a component. There is a concept of "mounting" and "unmounting" components from the vdom tree, though. When reactive data changes, and vue rerenders the tree, it will do a diff of the old tree, to the new tree. At this point it may 1) unmount a component which does not appear in the new tree 2) mount a component that appears in the new tree, but not the old 3) rerender a component which is in both, but who's props have changed

Adding a key will make vue consider two vnodes as different

So the ultimate question is, will vue be mounting your component, and this totally depends on how your routes are setup. spock_vue1

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ESLINT RULES DISABLE

http://eslint.org/docs/user-guide/getting-started#configuration

"off" or 0 - turn the rule off
"warn" or 1 - turn the rule on as a warning (doesn’t affect exit code)
"error" or 2 - turn the rule on as an error (exit code will be 1)

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Base Example

There may be data/utilities you’d like to use in many components, but you don’t want to pollute the global scope. In these cases, you can make them available to each Vue instance by defining them on the prototype:

Vue.prototype.$appName = 'My App'

Now $appName is available on all Vue instances, even before creation. If we run:

new Vue({
  beforeCreate: function() {
    console.log(this.$appName)

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Open Source projects I can work on

• Write a Book (user can write,edit and download it via pdf).
• Create a Book Sharing Business Model

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const genRandomString = function(length){
  return crypto.randomBytes(Math.ceil(length/2))
          .toString('hex') /** convert to hexadecimal format */
          .slice(0,length);   /** return required number of characters */
};
const sha512 = function(password, salt){
  var hash = crypto.createHmac('sha512', salt); /** Hashing algorithm sha512 */
  hash.update(password);
  var value = hash.digest('hex');
  return {

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https://codepen.io/NLKNguyen/pen/pjwvOB

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Sources

• Glitch