performanceTime

Get high-precision timestamp, supporting both browser and Node.js environments.

API

performanceTime

Return

Argument	Description	Type
number	High-precision timestamp (milliseconds)	number

Parameters

No parameters

Example

Basic Usage

import { performanceTime } from 'ranuts';

const start = performanceTime();
// Execute some operations
const end = performanceTime();
console.log(`Duration: ${end - start} ms`);

Performance Measurement

import { performanceTime } from 'ranuts';

const start = performanceTime();
// Execute time-consuming operations
for (let i = 0; i < 1000000; i++) {
  Math.sqrt(i);
}
const end = performanceTime();
console.log(`Operation duration: ${end - start} ms`);

Function Execution Time

import { performanceTime } from 'ranuts';

function expensiveFunction() {
  // Complex calculation
  return Math.random() * 1000;
}

const start = performanceTime();
const result = expensiveFunction();
const end = performanceTime();
console.log(`Result: ${result}, Duration: ${end - start} ms`);

Notes

1. Environment support:

   • Browser environment: Uses performance.now()
   • Node.js environment: Uses process.hrtime()
   • Other environments: Falls back to Date.now()

2. Precision: performance.now() and process.hrtime() provide microsecond-level precision, more accurate than Date.now().

3. Relative time: The returned timestamp is relative time, suitable for measuring time differences, not suitable for use as absolute time.

4. Unit: Return value is in milliseconds.