Benchmark: numeric vs string property accessor

Script Preparation code:

/*your preparation JavaScript code goes here
To execute async code during the script preparation, wrap it as function globalMeasureThatScriptPrepareFunction, example:*/
async function globalMeasureThatScriptPrepareFunction() {
    // This function is optional, feel free to remove it.
    // await someThing();
}

Tests:

numeric keys
let o = {}; // write for (let n=1; n <= 1000; n++) { if (o[n] === undefined) o[n] = n; } // read let sum = 0; for (let n=1; n <= 1000; n++) { if (o[n] !== undefined) sum += o[n]; } //console.log("numeric keys - sum ", sum); // expects 500500 (1 - 1000)
string keys
let o = {}; // write for (let n=1; n <= 1000; n++) { if (o[n.toString()] === undefined) o[n.toString()] = n; } // read let sum = 0; for (let n=1; n <= 1000; n++) { if (o[n.toString()] !== undefined) sum += o[n.toString()]; } //console.log("string keys - sum ", sum); // expects 500500 (1 - 1000)
string keys, with key caching (n.toString())
let o = {}; let k; // write for (let n=1; n <= 1000; n++) { k = n.toString(); if (o[k] === undefined) o[k] = n; } // read let sum = 0; for (let n=1; n <= 1000; n++) { k = n.toString(); if (o[k] !== undefined) sum += o[k]; } //console.log("string keys - sum ", sum); // expects 500500 (1 - 1000)
string keys, with key caching ("" + n)
let o = {}; let k; // write for (let n=1; n <= 1000; n++) { k = "" + n; if (o[k] === undefined) o[k] = n; } // read let sum = 0; for (let n=1; n <= 1000; n++) { k = "" + n; if (o[k] !== undefined) sum += o[k]; } //console.log("string keys - sum ", sum); // expects 500500 (1 - 1000)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
numeric keys
string keys
string keys, with key caching (n.toString())
string keys, with key caching ("" + n)

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Windows

View result in a separate tab

Test name	Executions per second
numeric keys	107311.8 Ops/sec
string keys	35180.0 Ops/sec
string keys, with key caching (n.toString())	48175.7 Ops/sec
string keys, with key caching ("" + n)	57492.6 Ops/sec

Related benchmarks:

numeric vs string property accessor (version: 4)

compare setting and getting values of property accessed via numeric key and string key

Comparing performance of: numeric keys vs string keys vs string keys, with key caching (n.toString()) vs string keys, with key caching ("" + n)

Created: one year ago by: Registered User

Jump to the latest result

numeric keys

string keys

string keys, with key caching (n.toString())

string keys, with key caching ("" + n)

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A