TIL that Javascript engines optimize out unused variables available in outer lexical environment if they aren't used inside nested functions.
Earlier I used to think this is the default Spec behaviour but it's rather an optimization 💡.
In this video, we see how exactly Firefox confirms that for us !!
For further actions, you may consider blocking this person and/or reporting abuse
Coherence is the first Platform-as-a-Service you can control. Unlike "black-box" platforms that are opinionated about the infra you can deploy, Coherence is powered by CNC, the open-source IaC framework, which offers limitless customization.
Aarav Joshi -
Calvince Moth -
Aarav Joshi -
Brian Keary -
Top comments (2)
People really underestimate the power of JS engines, and what you pinpointed in this video is just a spec in a sea of optimizations within those engines. They all utilize cutting edge of optimization techniques, and this example with closures is not new.
Anyway, good video.
Thanks for sharing 🙌