JavaScript & Frontend · page 4

Test promise rejection handling in a controlled browser environment.

Simulate selected runtime errors and inspect application recovery behavior.

Detect debugger statements in source files.

Identify known deprecated API usage patterns.

Review source features against a selected browser target.

Inventory polyfills and compare them with the project's browser support target.

Generate feature detection snippets for browser APIs.

Illustrate synchronous execution, microtasks, and task queue ordering.

Demonstrate promise resolution, chaining, and rejection.

Demonstrate declaration hoisting and temporal dead zone behavior.

Explore how `this` behaves in different invocation contexts.

Display object keys, values, and nested properties from sample JSON.

Compare object cloning strategies using supported sample values.

Demonstrate how JavaScript converts values in common expressions.

Display timezone offsets and explain date serialization behavior.

Display numbered and named capture groups for test matches.

Test URL construction, query parameters, and relative URL resolution.

Generate query strings from key-value pairs.

Parse sample query strings into structured key-value output.

Validate JSON samples against a supplied schema.

Preview JSON serialization of compatible JavaScript data.

Experiment with Map and Set behavior and common operations.

Inspect comparator results and identify inconsistent ordering logic.

Trace recursive function calls with a configurable sample.