Expired50% confidenceFactExact time
The let and const introduced in ES6 use block-level scope delimited by curly braces {}, and have a Temporal Dead Zone, meaning accessing the variable before its declaration statement throws an error.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
This claim has expired. It is kept for the record and no longer describes the current state.
Valid until: 9/30/2026(expired)
Sources
JavaScript Fundamentals: A Complete Guide to Variables, DOM Manipulation, Event Handling, and API Calls
bilibiliFireUG技术社区6/21/2026
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