Loading...
Please wait a moment
Founded by passionate advocates of learning and innovation, Learni set out to make professional training accessible to everyone, everywhere in the world. Our team works in the largest cities such as Paris, Lyon, Marseille, and internationally, to support talents and organizations in their skills development.
Which format do you prefer?
30 free minutes with a training advisor — no commitment.
Loading available slots...
Explore the latest Power BI training options, essential Microsoft certifications like PL-300 and DP-600, and promising career trajectories for data professionals targeting April 2026.
Professional Training training in Dallas in July 2026 with Learni. Certified, expert trainers, eligible for employer funding. Free quote.
No-Code / Low-Code training in Leeds in November 2026 with Learni. Certified, expert trainers, eligible for employer funding. Free quote.
Discover comprehensive Tailwind CSS training essentials for web developers. Learn utility-first styling, best practices, and future trends shaping web design in April 2026.
Don't let this gap widen
Without advanced JavaScript, your apps leak 25% memory on average, crash on poorly managed promises (40% production bugs reported), lose 3x speed without prototype optimization, block user scaling (50% satisfaction drop), burden maintenance (2x dev time), expose security flaws via unprotected states, cost 15k€/year in lost performance.
Master it to boost project ROI x4.
The Advanced JavaScript Training - Master ESNext and Performance training is delivered in-person or remotely (blended-learning, e-learning, virtual classroom, remote in-person). At Learni, a Qualiopi-certified training organization, each program is designed to maximize skills acquisition, regardless of the training mode chosen.
The trainer alternates between demonstrative, interrogative, and active methods (through practical exercises and/or real-world scenarios). This pedagogical approach ensures concrete and directly applicable learning in the workplace.
To ensure the quality of the Advanced JavaScript Training - Master ESNext and Performance training, Learni provides the following teaching resources:
For in-house training at a location external to Learni, the client ensures and commits to having all necessary teaching materials (IT equipment, internet connection...) for the proper conduct of the training action in accordance with the prerequisites indicated in the communicated training program.
The assessment of skills acquired during the Advanced JavaScript Training - Master ESNext and Performance training is carried out through:
Learni is committed to the accessibility of its professional training programs. All our training programs are accessible to people with disabilities. Our teams are available to adapt teaching methods to your specific needs. Do not hesitate to contact us for any accommodation request.
Learni training programs are available for inter-company and intra-company settings, both in-person and remote. Registration is possible up to 48 business hours before the start of training. Our programs are eligible for OPCO, Pôle emploi, and FNE-Formation funding. Contact us to discuss your training project and funding possibilities.
Dive into practical exercises on closures and prototypes to refactor legacy code, optimize real apps with Web Workers and throttling on massive datasets, implement ESNext modules via Vite for ultra-fast builds, manipulate reactive states with Proxy on concrete e-commerce cases, master generators and async iterators for scalable APIs, produce a personal project deliverable deployed, all while live debugging with advanced Chrome DevTools.
Target audience
Frontend developers, fullstack developers, tech leads advancing their JavaScript skills.
Prerequisites
Mastery of ES6+, DOM, async/await, real-world web projects.
Loading...
Please wait a moment





























