Promise.prototype.finally was introduced in ES2018, not E2019

[yg-i]

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Edition: (1st or 2nd)
2nd

Book Title:
Getting Started

Chapter:
1

Section Title:
Filling the Gaps

Problem:
Re: the sentences

This code uses an ES2019 feature, the finally(..) method on the promise prototype. If this code were used in a pre-ES2019 environment, the finally(..) method would not exist, and an error would occur.

it seems that Promise.prototype.finally() was introduced in ES2018, not ES2019. See e.g.

1. ES2018 spec: https://262.ecma-international.org/9.0/#sec-promise.prototype.finally
2. contemporaneous references: 1 2

[Kyle Simpson]

Eh. Seems irrelevant.