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There is a newer version: 10.20.0.29356

An array declared with missing ("sparse") elements is likely to be an error: an extra comma was inserted or perhaps the developer meant to insert
the missing value and forgot.
Noncompliant Code Example
let a = [1, , 3, 6, 9];  // Noncompliant

Compliant Solution
let a = [1, 3, 6, 9];