performanceadvanced

performance — getEntriesByName after mark

📖 Usage Example

const entries = performance.getEntriesByName('task')
entries[0].duration  // → elapsed ms

getEntriesByName() retrieves the duration of a specific named performance measure.

performance.getEntriesByName()

After calling performance.mark(name), the entry is retrievable via performance.getEntriesByName(name).

Challenge: Verify that getEntriesByName returns exactly one entry after a single mark.

💡 Hints (1)

• Always clearMarks before marking in tests to prevent entries accumulating across runs

9/10