String split + join or charAt + concat (version: 1)

Performance differences of using inbuilt string and array methods for splitting and joining char array. Or using loops to extract chars and string concatenation for joining.

Comparing performance of: split + join vs charAt + join vs split + concat vs charAt + concat

Created: one year ago by: Registered User
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HTML Preparation code:
Script Preparation code:
Tests:

Historical Performance Data aggregated from 5 community runs

Desktop Results:
Chrome 5 runs
charAt + concat
119.7M/s
charAt + join
72.3M/s
split + concat
1.9M/s
split + join
642K/s

Fastest: charAt + concat (186.5x faster)

View exact numbers
  • ✓ charAt + concat: 119,702,512 ops/sec
  • • charAt + join: 72,317,432 ops/sec
  • • split + concat: 1,884,730 ops/sec
  • • split + join: 641,945 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results
  • Test case name Result
    split + join
    charAt + join
    split + concat
    charAt + concat

    Fastest: N/A

    Slowest: N/A

Latest run results:
Run details: (Test run date: one year ago)
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:138.0) Gecko/20100101 Firefox/138.0
Firefox 138 on Ubuntu
View result in a separate tab
charAt + concat
325.4M/s
charAt + join
120.7M/s
split + concat
1.4M/s
split + join
1.1M/s
View exact numbers
Test name Executions per second
✓ charAt + concat 325,355,296 Ops/sec
charAt + join 120,701,800 Ops/sec
split + concat 1,428,616 Ops/sec
split + join 1,105,255 Ops/sec

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