Benchmark: flatMap count vs reduce count

Script Preparation code:

var arr = [
  {
    loanId: 1077579,
    missingDocs: [
      { docTypeID: 4, docType: "CEMA" },
      { docTypeID: 14, docType: "Policy" },
    ],
  },
  {
    loanId: 1077579,
    missingDocs: [
      { docTypeID: 4, docType: "CEMA" },
      { docTypeID: 14, docType: "Policy" },
    ],
  },
  {
    loanId: 1077579,
    missingDocs: [
      { docTypeID: 4, docType: "CEMA" },
      { docTypeID: 14, docType: "Policy" },
    ],
  },
  {
    loanId: 1077579,
    missingDocs: [
      { docTypeID: 4, docType: "CEMA" },
      { docTypeID: 14, docType: "Policy" },
    ],
  },
  {
    loanId: 1077579,
    missingDocs: [
      { docTypeID: 4, docType: "CEMA" },
      { docTypeID: 14, docType: "Policy" },
    ],
  },
  {
    loanId: 1077579,
    missingDocs: [
      { docTypeID: 4, docType: "CEMA" },
      { docTypeID: 14, docType: "Policy" },
    ],
  },
  {
    loanId: 1077579,
    missingDocs: [
      { docTypeID: 4, docType: "CEMA" },
      { docTypeID: 14, docType: "Policy" },
    ],
  },
  {
    loanId: 1077579,
    missingDocs: [
      { docTypeID: 4, docType: "CEMA" },
      { docTypeID: 14, docType: "Policy" },
    ],
  },
  {
    loanId: 1077579,
    missingDocs: [
      { docTypeID: 4, docType: "CEMA" },
      { docTypeID: 14, docType: "Policy" },
    ],
  },
  {
    loanId: 1077579,
    missingDocs: [
      { docTypeID: 4, docType: "CEMA" },
      { docTypeID: 14, docType: "Policy" },
    ],
  },
  {
    loanId: 1077579,
    missingDocs: [
      { docTypeID: 4, docType: "CEMA" },
      { docTypeID: 14, docType: "Policy" },
    ],
  },
  {
    loanId: 1077579,
    missingDocs: [
      { docTypeID: 4, docType: "CEMA" },
      { docTypeID: 14, docType: "Policy" },
    ],
  },
];

Tests:

reduce with concat
arr.reduce((acc, loan) => acc + loan.missingDocs.length, 0)
flatMap
arr.flatMap(loan => loan.missingDocs).length

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
reduce with concat
flatMap

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (iPad; CPU OS 14_8 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/96.0.4664.53 Mobile/15E148 Safari/604.1

Browser/OS: Chrome Mobile iOS 96 on iOS 14.8

View result in a separate tab

Test name	Executions per second
reduce with concat	8880006.0 Ops/sec
flatMap	2469771.0 Ops/sec

flatMap count vs reduce count (version: 0)

Comparing performance of: reduce with concat vs flatMap

Created: 2 years ago by: Guest

Jump to the latest result

reduce with concat

flatMap

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A