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Promises vs Callbacks – Code comparison

I am not going to highlight pros of promises and cons of callbacks. There is plenty of good reading about this topic out there. I was recently writing simple Node module and decided to learn promises during its implementation. The result  can be interesting as comparison of Promises vs Callbacks approach applied to the same problems, because project contains Two ...

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Learning Angular: What is the scope of your directive?

This might create quite some debugging headaches, especially in a larger application. Things don’t bind properly, have different data on the scope than you’d expect etc.. When you define your directives, you have to be really careful about their scope. This article is part of my “Learning NG” series, presenting some of my adventures while learning Angular. Check out the ...

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Real-time Profiling a MongoDB Sharded Cluster

In a sharded cluster of replica sets, which server or servers handle each of your queries? What about each insert, update, or command? If you know how a MongoDB cluster routes operations among its servers, you can predict how your application will scale as you add shards and add members to shards. Operations are routed according to the type of ...

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Make Me a Promise

If you haven’t worked with JavaScript in over a decade, you might be surprised at the advances that have been made in this language. At one time, JavaScript was used mainly for swapping “one image for another in response to user-generated mouse events” [1], and now, it is a full-fledged language used for both front end and back end work. ...

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PHP Form Validation Example

EDITORIAL NOTE: In this post, we feature a comprehensive PHP Form Validation Example. Data is an integral part of an application. There is a golden rule for developers. Never trust your user’s information. So, we need to always filter and validate the user entered before storing it in application’s database. In this article, we will learn how to perform basic ...

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JavaScript Document Ready Example

“Document ready” is a technique widely used by everyone who uses JavaScript or jQuery in their code, yet only a few people know exactly why it is used. Primarily, it is used to make sure that all your external scripts are loaded properly. Other reasons to use it are for having unobtrusive JavaScript and separation of concerns. Another perk is ...

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Dynamic aria-live for better accessibility experience

Every web developer working with the web accessibility (WAI ARIA) knows or heard about aria-live. This is an attribute, which indicates a live region – any updatable HTML element – and describes the types of updates the user agents, assistive technologies (screen readers), and user can expect from the live region. The default value of the aria-live is off. That means, updates to ...

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AngularJS UI-Router – Introduction

This is the first post of a series of 3, presenting AngularJS UI-Router library: Part 1: Introduction Part 2: Components AngularJS UI-Router – Example         Introduction AngularJS is a well-known Javascript framework nowadays. It provides a great support to create SPA (Single Page Applications), easing some of the tedious stuff needed when writing client-side Javascript applications (boilerplate ...

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