Expired50% confidenceFactExact time

let and const have a Temporal Dead Zone, and accessing a variable before its declaration statement will throw 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

Related Claims

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