12. Rest Operator & Optional Chaining in JavaScript | ES6 Features | Playwright TypeScript 2026

Published: 01 July 2026
on channel: QAFox

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📌 JavaScript for Playwright – Part 11 | Rest Operator & Optional Chaining | Playwright TypeScript 2026

In Part 11 of the Playwright TypeScript 2026 series, we explore two powerful ES6+ JavaScript features that every Playwright automation engineer should know: Rest Operator (...) and Optional Chaining (?.).

🔹 Rest Operator

Understanding the ... syntax
Collecting multiple values into a single array
Function parameters with Rest Operator
Why the rest parameter must be the last parameter
Using Rest Operator with Arrays
Using Rest Operator with Objects
Rest vs Spread Operator explained

🔹 Optional Chaining

Syntax and usage
The problem Optional Chaining solves
Multiple Optional Chains
Optional Chaining with Arrays
Optional Chaining with Functions
Preventing runtime errors when accessing nested properties

💡 These concepts are extremely useful when working with Playwright test data, API responses, configuration objects, and dynamic web elements.

Whether you're preparing for Playwright interviews or building robust test automation frameworks, mastering these modern JavaScript features will make your code cleaner, safer, and more maintainable.

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