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jsPerf.app is an online JavaScript performance benchmark test runner & jsperf.com mirror. It is a complete rewrite in homage to the once excellent jsperf.com now with hopefully a more modern & maintainable codebase.

jsperf.com URLs are mirrored at the same path, e.g:

https://jsperf.com/negative-modulo/2

Can be accessed at:

https://jsperf.app/negative-modulo/2

Test case details

Title *

Description
(Markdown syntax is allowed)

Preparation Code

Preparation HTML
(this will be inserted in the <body> of a valid HTML5 document in standards mode)
(useful when testing DOM operations or including libraries)

Setup JS

var data = { ...Array.from(Array(10000).keys()) };

Teardown JS

Test cases

Test #1

Title *

Async

Code *Object.fromEntries(Object.entries(data).filter((d) => d[1]));

Test #2

Title *

Async

Code *

  Object.entries(data).reduce(
    (acc, [key, value]) =>
      value === undefined ? acc : { ...acc, [key]: value },
    {}
  );

Test #3

Title *

Async

Code *

const res={}
Object.entries(data).forEach(([key, value])=>{
	if(value){
		res[key]=value
	}
})

Test #4

Title *

Async

Code *

  const res = new Map();
  Object.entries(data).forEach(([key, value]) => {
    if (value) {
      res.set(key, value);
    }
  });