A 30-day JavaScript roadmap for QA engineers

Week 1: values, operators, conversion, equality. You already use these in locators and status checks — name the rules out loud.

Week 2: functions, arrays, objects, map/filter. Most API assertions are object walks. Off-by-one and mutating sort() in a shared fixture are classic flakes.

Week 3: closures, this, prototypes, async/await, fetch. This is the interview core.

Week 4: JSON, cookies, Node/npm, assertions, a mock interview. Download a track certificate when a course hits 100%. Keep a streak of small daily sessions rather than one exhausted Saturday.