Benchmark: Object.values on array vs Object

Script Preparation code:

var obj = {}
for(let i = 0; i < 50; ++i) {
  let k = String.fromCharCode((i % 26) + 97);
  obj[k] = i;
}

var arr = Object.values(obj);
var dest = null;

Tests:

a
dest = Object.values(arr);
o
dest = Object.values(obj);
ac
if( Array.isArray(arr) ) { dest = arr; } else { dest = Object.values(arr); }
oc
if( Array.isArray(obj) ) { dest = obj; } else { dest = Object.values(obj); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
a
o
ac
oc

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 9 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36 Edg/138.0.0.0

Browser/OS: Chrome 138 on Windows

View result in a separate tab

Test name	Executions per second
a	5649175.5 Ops/sec
o	561100.6 Ops/sec
ac	10675785.0 Ops/sec
oc	569173.8 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what is being tested.

**Benchmark Definition**

The benchmark compares three different approaches to achieve the same result:

1. `Object.values(arr)` or `Object.values(obj)`
2. `if (Array.isArray(arr)) { dest = arr; } else { dest = Object.values(arr); }`
3. `if (Array.isArray(obj)) { dest = obj; } else { dest = Object.values(obj); }`

**What is being tested?**

The benchmark tests the performance of these three approaches on arrays and objects. The test creates an array or object with 50 properties, each containing a unique value from 0 to 25 (using ASCII code).

**Options compared**

Here's a summary of what's being compared:

* `Object.values(arr)` vs `if (Array.isArray(arr)) { dest = arr; } else { dest = Object.values(arr); }`
	+ Pros:
		- Concise and readable
		- Avoids unnecessary checks for array type
	+ Cons:
		- May be slower due to the additional check and potential overhead of `Object.values()`
* `Object.values(obj)` vs `if (Array.isArray(obj)) { dest = obj; } else { dest = Object.values(obj); }`
	+ Pros:
		- Similar to option 1, but for objects
	+ Cons:
		- May be slower due to the additional check and potential overhead of `Object.values()`

**Special considerations**

There are no special JavaScript features or syntax used in this benchmark.

**Alternatives**

Other alternatives could include:

* Using a library like Lodash or Immutable.js, which provide optimized implementations for array and object manipulation.
* Implementing custom optimizations for specific use cases or performance-critical code.
* Using native WebAssembly (WASM) or other low-level languages to achieve performance enhancements.

Overall, the benchmark provides a useful comparison of three common approaches to accessing values in arrays and objects. By understanding the trade-offs between conciseness, readability, and performance, developers can make informed decisions about how to optimize their code for specific use cases.

Related benchmarks:

Object.values on array vs Object (version: 0)

Is it significantly better to do Object.values(<array or object>) or if( Array.isArray(<array or object>) ) { array = <array or object> } else { Object.values(obj) }

Comparing performance of: a vs o vs ac vs oc

Created: 5 years ago by: Guest

Jump to the latest result

a

o

ac

oc

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):