HackerRank is a technology company that focuses on competitive programming challenges for both consumers and businesses, where developers compete by trying to program according to provided specifications.HackerRank's programming challenges can be solved in a variety of programming languages (including Java, C++, PHP,Python,SQL) and span multiple computer science domains.
On the consumer side, when a programmer submits a solution to a programming challenge, their submission is scored on the accuracy of their output and the execution time of their solution.
Codecademy is an online interactive platform that offers free coding classes in 12 different Progamming languages including Python,Java,PHP (jQuery,AngularsJS,React.js),Ruby,SQl,Sass,as well as Markup languages HTML and CSS.
FREE CODE CAMP
FreeCodeCamp is a nonprofit organization that consists of an interactive learning web platform, an online community forum, chat rooms,medium publications, and local organizations that intend to make learning web development accessible to anyone. Beginning with tutorials that introduce students to HTML, CSS, and JavaScript, students progress to project assignments that they must complete either alone or in pairs. Upon completion of all project tasks, students are partnered with other nonprofits to build web applications, giving the students practical development experience.
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