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Vue News Tuesday, April 3 Object constructor function, Vue object constructor, Pen & more…

Vue News TLDR / Table of Contents

  • A deep dive in the Vue.js source code – oneminutejs – –
    • This series presents an exhaustive dive in the Vue.js source code in order to illustrate fundamental JavaScript concepts. It attempts to break concepts down to a level that JavaScript beginners can…
    • object constructor function, Vue object constructor, , ,
  • Vue JS Draw
    • Wanted to create a drawing app that uses VueJS for it’s interface and data management. 🙂 Feel free to steal it…
    • Pen, true dependency, file extension, preprocessor, HTML preprocessors
  • React: First Steps
    • If you are new to React, be sure to read this article!
    • render method, React, component, React Guide Props, React Router v4
  • In the Vue.js source code, new Vue instances are created using the Vue object constructor function: – function Vue (options) { – if (process.env.NODE_ENV !
  • Object constructor functions generally begin with a capital letter by convention: – function Vue (options) { – [. . . .] – }You call an object constructor function with the new keyword.
  • For example, you might call the Vue constructor function as follows: – var vm = new Vue({ – // options – })Calling an object constructor function returns a new object and sets the this keyword to the object returned.
  • function Vue (options) { – [. . . .] – }The Vue object constructor function tests whether the current environment is not the production environment using an if statement: – [….] – if (process.env.NODE_ENV !
  • (this instanceof Vue) – ) { – warn(‘Vue is a constructor and should be called with the `new` keyword’); – } – [….]If you are in a development environment and this is not an instanceof Vue, then the object constructor function calls the warn function and passes a string as…

Tags: object constructor function, Vue object constructor, , ,

  • You can apply CSS to your Pen from any stylesheet on the web.
  • Just put a URL to it here and we’ll apply it, in the order you have them, before the CSS in the Pen itself.
  • If the stylesheet you link to has the file extension of a preprocessor, we’ll attempt to process it before applying.
  • You can also link to another Pen here, and we’ll pull the CSS from that Pen and include it.
  • If it’s using a matching preprocessor, we’ll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

Tags: Pen, true dependency, file extension, preprocessor, HTML preprocessors

  • All the simple parts of the code should be written as dummy components (often also called pure), meaning that they will only render based on parameters passed to them, and won’t have an idea on any app logic.
  • Here are two examples of a dummy component: – – You can pass the whole object as props using {…objectName} syntax; this will pass every key-value from objectName as separate prop.
  • Components written this way are called smart components or classes and can have other methods bound to it besides render method.
  • Anything can be a prop: a string, boolean, number, some other React element, undefined… – – The most important thing to keep in mind about the props is that they are read-only, meaning that they can’t be changed in the component receiving them and shouldn’t be mutated.
  • I have actually covered this in React Guide Props – Part I. – – Methods handling the component lifecycle are inherited from Component (yes, that Component you’re importing at the top of the file).

Tags: render method, React, component, React Guide Props, React Router v4

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