ES6 Overview repository is an extensive written overview of ECMAScript 6 (ES2015), summarized in roughly 350 bullet points. It condenses a long article series into a single document that walks through the most important syntax changes and language features introduced in ES6. Topics include block-scoped declarations (let, const), arrow functions, classes, modules, destructuring, rest/spread, template strings, iterators, generators, maps/sets, promises, and more.