<p>freeCodeCamp's JavaScript Algorithms and Data Structures certification (legacy V7 curriculum) teaches the fundamentals of JavaScript, including variables, arrays, objects, loops and functions, then applies them by writing algorithms that manipulate strings, factorialize numbers and even calculate the orbit of the International Space Station. freeCodeCamp notes this version is no longer being updated but remains available, and recommends its current curriculum.</p> <ul> <li>Open to all; no fees</li> <li>Nine challenge sections: Basic JavaScript, ES6, Regular Expressions, Debugging, Basic Data Structures, Basic Algorithm Scripting, Object Oriented Programming, Functional Programming, and Intermediate Algorithm Scripting</li> <li>Introduces two programming paradigms: Object Oriented Programming and Functional Programming</li> <li>Ends with the JavaScript Algorithms and Data Structures Projects section</li> <li>Self-paced</li> </ul> <p>Create a free freeCodeCamp account to save your progress and work towards the certificate.</p>