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How We Moved From Heroku To Containers With No Docker Experience

Sign Up for FREE on to get access to out-of-box multi-tier Java, Ruby, Python, and PHP templates along with application lifecycle management functionality like monitoring, container updates, scale in/out and continuous delivery. As a growing startup that provides a SaaS platform to automate B2B sales lead management and social selling at scale, ProLeads has been pressed to deliver more valuable features ...

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jQuery Filter Example

The aim of this example is to have a look at the .fiter(); method of jQuery. What this method does is reduce the set of matched elements to those that match the selector or pass the function’s test. In other words, the filter() method returns elements that match a certain criteria. It lets you specify a criteria. Elements that do ...

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Deploying Your Docker Rails App

In a previous article by Marko Locher, we learned how to run a Rails development environment in Docker. Marko also wrote about how to test a Rails app with Docker. So assuming we have our dev environment set up, our app is tested (and the tests are passing), we’re ready to think about deploying our application to production. If you ...

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MockupDB: Testing The MongoDB C Driver With Python

This is the third article in my series on “black pipe” testing. The series describes how to test networked code, like a MongoDB driver. Such code has two distinct public surfaces: one is its API, and the other is its communication over the network. Treating it as a black box tests just one surface, the API. To test both, we ...

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Testing PyMongo As A Black Pipe

This is the second article in my six-part series on “black pipe” testing. PyMongo, the official Python client for MongoDB, is a great example of a connected application that can’t be fully tested as a black box. It has two ends that take inputs and provide outputs: one is its public API, the methods find and insert_one and so on. ...

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jQuery Fadeout Example

In this example, the aim is to explain and use the .fadeOut() jQuery method. The fadeOut() method gradually changes the opacity, for selected elements, from visible to hidden (fading effect). If you’ve used this method previously, you probably know it is just the opposite of the .fadeIn() method. It hides the matched elements by fading them to transparent. It comes ...

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jQuery slideToggle / slideUp / slideDown Example

In this example, we’ll be considering three popular jQuery methods .slideUp, .slideDown, .slideToggle. For your basic understanding, know that slideUp hides the matched elements with a sliding motion, slideDown displays the matched elements with a sliding motion, while slideToggle will toggle between the two states, meaning it will display or hide the matched elements with a sliding motion. The methods ...

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Alternative Service Communication Using Pub/Sub

The HTTP protocol was designed for synchronous communication between two entities — for instance, a browser requesting a stylesheet or a server charging with a payment processor. Those are synchronous operations where nothing can proceed without an immediate response. Often communication can be asynchronous, like when queueing up work to be performed in the background. It is possible to use ...

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jQuery Find Example

In this example we’re going to talk about the .find() method of jQuery. What this method does is kind of self-explanatory, it gets the descendants of each element in the current set of matched elements, filtered by a selector, jQuery object, or element. A descendant is a child, grandchild, great-grandchild, and so on. It has only one argument, which is ...

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