Benchmark: Uint8Array to String

Script Preparation code:

uint8Array = Uint8Array.from([...Array(2 ** 16)].map(() => Math.floor(Math.random() * (2 ** 8))));
CHUNK_SZ = 0x8000;

function strapply_arrpush(uint8Array) {
  const c = [];
  for (let i = 0; i < uint8Array.length; i += CHUNK_SZ) {
    c.push(
      String.fromCharCode.apply(null, uint8Array.subarray(i, i + CHUNK_SZ))
    );
  }
  return c.join("");
}

function strapply_arrconcat(uint8Array) {
  let c = [];
  for (let i = 0; i < uint8Array.length; i += CHUNK_SZ) {
    c = c.concat(
      String.fromCharCode.apply(null, uint8Array.subarray(i, i + CHUNK_SZ))
    );
  }
  return c;
}

function strapply_strconcat(uint8Array) {
  let s = "";
  for (let i = 0; i < uint8Array.length; i += CHUNK_SZ) {
    s += (
      String.fromCharCode.apply(null, uint8Array.subarray(i, i + CHUNK_SZ))
    );
  }
  return s;
}

function strspread_arrpush(uint8Array) {
  const c = [];
  for (let i = 0; i < uint8Array.length; i += CHUNK_SZ) {
    c.push(
      String.fromCharCode(...uint8Array.subarray(i, i + CHUNK_SZ))
    );
  }
  return c.join("");
}

function strspread_arrconcat(uint8Array) {
  let c = [];
  for (let i = 0; i < uint8Array.length; i += CHUNK_SZ) {
    c = c.concat(
      String.fromCharCode(...uint8Array.subarray(i, i + CHUNK_SZ))
    );
  }
  return c;
}

function strspread_strconcat(uint8Array) {
  let s = "";
  for (let i = 0; i < uint8Array.length; i += CHUNK_SZ) {
    s += (
      String.fromCharCode(...uint8Array.subarray(i, i + CHUNK_SZ))
    );
  }
  return s;
}

Tests:

strapply_arrpush
strapply_arrpush(uint8Array)
strapply_arrconcat
strapply_arrconcat(uint8Array)
strapply_strconcat
strapply_strconcat(uint8Array)
strspread_arrpush
strspread_arrpush(uint8Array)
strspread_arrconcat
strspread_arrconcat(uint8Array)
strspread_strconcat
strspread_strconcat(uint8Array)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
strapply_arrpush
strapply_arrconcat
strapply_strconcat
strspread_arrpush
strspread_arrconcat
strspread_strconcat

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 6 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36 OPR/102.0.0.0

Browser/OS: Opera 102 on Windows

View result in a separate tab

Test name	Executions per second
strapply_arrpush	4827.6 Ops/sec
strapply_arrconcat	4947.6 Ops/sec
strapply_strconcat	4919.4 Ops/sec
strspread_arrpush	915.7 Ops/sec
strspread_arrconcat	926.8 Ops/sec
strspread_strconcat	926.3 Ops/sec

Uint8Array to String (version: 0)

Benchmark of various methods used to convert a Uint8Array to a string value

Comparing performance of: strapply_arrpush vs strapply_arrconcat vs strapply_strconcat vs strspread_arrpush vs strspread_arrconcat vs strspread_strconcat

Created: 3 years ago by: Guest

Jump to the latest result

strapply_arrpush

strapply_arrconcat

strapply_strconcat

strspread_arrpush

strspread_arrconcat

strspread_strconcat

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A