perf(serializer): optimize array serialization by removing arrayEnd check

[cesco69]

Optimized array serialization by removing the arrayEnd check inside the hot loop. The serializer now uses a leading-comma strategy instead of checking if (i < arrayEnd) on each iteration.

MAIN

for (let i = 0; i < arrayLength; i++) {
  // ... CODE
  if (i < arrayEnd) {
    json += JSON_STR_COMMA
  }
}

PR

for (let i = 0; i < arrayLength; i++) {
  if (i) {
    json += JSON_STR_COMMA
  }
  // ... CODE
}

This is a micro-optimization FROM (i < arrayEnd) TO (i)

npm run bench:cmp

> [email protected] bench:cmp
> node ./benchmark/bench-cmp-branch.js

Select the branch you want to compare (feature branch):
perf-array-end
Select the branch you want to compare with (main branch):
main
Checking out "perf-array-end"
Execute "npm run bench"

> [email protected] bench
> node --expose-gc ./benchmark/bench.js

short string............................................. x 11,446,586 ops/sec ±1.23% (14420391 runs sampled)
unsafe short string...................................... x 13,957,911 ops/sec ±0.17% (18161063 runs sampled)
short string with double quote........................... x 9,915,924 ops/sec ±0.22% (10426960 runs sampled)
long string without double quotes........................ x 53,899 ops/sec ±0.38% (51201 runs sampled)
unsafe long string without double quotes................. x 13,444,366 ops/sec ±0.11% (17542374 runs sampled)
long string.............................................. x 51,138 ops/sec ±0.29% (49462 runs sampled)
unsafe long string....................................... x 14,171,248 ops/sec ±0.11% (18530093 runs sampled)
number................................................... x 17,419,930 ops/sec ±0.17% (22777816 runs sampled)
integer.................................................. x 14,154,510 ops/sec ±0.11% (18539264 runs sampled)
formatted date-time...................................... x 1,288,798 ops/sec ±0.23% (1246621 runs sampled)
formatted date........................................... x 1,120,467 ops/sec ±0.61% (1075059 runs sampled)
formatted time........................................... x 1,120,802 ops/sec ±0.26% (1078538 runs sampled)
short array of numbers................................... x 71,846 ops/sec ±0.39% (68497 runs sampled)
short array of integers.................................. x 67,728 ops/sec ±0.46% (63886 runs sampled)
short array of short strings............................. x 21,857 ops/sec ±0.49% (20982 runs sampled)
short array of long strings.............................. x 22,721 ops/sec ±0.45% (21887 runs sampled)
short array of objects with properties of different types x 11,080 ops/sec ±0.52% (10782 runs sampled)
object with number property.............................. x 16,842,454 ops/sec ±0.16% (22098035 runs sampled)
object with integer property............................. x 16,837,341 ops/sec ±0.16% (22118005 runs sampled)
object with short string property........................ x 11,581,717 ops/sec ±2.07% (14573414 runs sampled)
object with long string property......................... x 49,656 ops/sec ±0.29% (48120 runs sampled)
object with properties of different types................ x 2,087,554 ops/sec ±0.13% (1942125 runs sampled)
simple object............................................ x 8,138,463 ops/sec ±0.98% (6726046 runs sampled)
simple object with required fields....................... x 8,581,256 ops/sec ±0.92% (7189020 runs sampled)
object with const string property........................ x 14,606,940 ops/sec ±0.12% (19235347 runs sampled)
object with const number property........................ x 16,740,392 ops/sec ±0.12% (21911333 runs sampled)
object with const bool property.......................... x 14,321,953 ops/sec ±0.12% (18769245 runs sampled)
object with const object property........................ x 16,106,706 ops/sec ±0.15% (21117831 runs sampled)
object with const null property.......................... x 13,319,131 ops/sec ±0.19% (17274708 runs sampled)

Checking out "main"
Execute "npm run bench"

> [email protected] bench
> node --expose-gc ./benchmark/bench.js

short string............................................. x 11,955,239 ops/sec ±0.18% (15300593 runs sampled)
unsafe short string...................................... x 16,807,237 ops/sec ±0.13% (21971942 runs sampled)
short string with double quote........................... x 10,198,839 ops/sec ±0.16% (11568114 runs sampled)
long string without double quotes........................ x 60,590 ops/sec ±0.35% (57798 runs sampled)
unsafe long string without double quotes................. x 14,767,797 ops/sec ±1.12% (19396032 runs sampled)
long string.............................................. x 50,590 ops/sec ±0.30% (48860 runs sampled)
unsafe long string....................................... x 17,225,743 ops/sec ±0.13% (22523809 runs sampled)
number................................................... x 16,261,362 ops/sec ±0.13% (21302813 runs sampled)
integer.................................................. x 14,686,924 ops/sec ±0.17% (19158822 runs sampled)
formatted date-time...................................... x 1,284,932 ops/sec ±0.18% (1250203 runs sampled)
formatted date........................................... x 1,124,699 ops/sec ±0.29% (1082105 runs sampled)
formatted time........................................... x 1,120,633 ops/sec ±0.26% (1081227 runs sampled)
short array of numbers................................... x 72,997 ops/sec ±0.46% (68802 runs sampled)
short array of integers.................................. x 72,019 ops/sec ±0.44% (67783 runs sampled)
short array of short strings............................. x 23,295 ops/sec ±0.46% (22374 runs sampled)
short array of long strings.............................. x 23,199 ops/sec ±0.48% (22280 runs sampled)
short array of objects with properties of different types x 11,201 ops/sec ±0.54% (10854 runs sampled)
object with number property.............................. x 14,067,614 ops/sec ±0.15% (18439734 runs sampled)
object with integer property............................. x 14,590,938 ops/sec ±0.15% (19173806 runs sampled)
object with short string property........................ x 11,477,657 ops/sec ±1.21% (14427841 runs sampled)
object with long string property......................... x 51,817 ops/sec ±0.29% (50030 runs sampled)
object with properties of different types................ x 2,126,808 ops/sec ±0.19% (1964332 runs sampled)
simple object............................................ x 7,790,030 ops/sec ±0.78% (6239627 runs sampled)
simple object with required fields....................... x 8,500,411 ops/sec ±0.28% (7069042 runs sampled)
object with const string property........................ x 14,059,843 ops/sec ±0.17% (18318134 runs sampled)
object with const number property........................ x 16,628,530 ops/sec ±0.16% (21715563 runs sampled)
object with const bool property.......................... x 14,262,104 ops/sec ±0.15% (18676180 runs sampled)
object with const object property........................ x 13,390,182 ops/sec ±0.19% (17312968 runs sampled)
object with const null property.......................... x 14,013,509 ops/sec ±0.14% (18278200 runs sampled)

short string..............................................-4.25%
unsafe short string......................................-16.95%
short string with double quote............................-2.77%
long string without double quotes........................-11.04%
unsafe long string without double quotes..................-8.96%
long string...............................................+1.08%
unsafe long string.......................................-17.73%
number....................................................+7.12%
integer...................................................-3.63%
formatted date-time........................................+0.3%
formatted date............................................-0.38%
formatted time............................................+0.02%
short array of numbers....................................-1.58%
short array of integers...................................-5.96%
short array of short strings..............................-6.17%
short array of long strings...............................-2.06%
short array of objects with properties of different types.-1.08%
object with number property..............................+19.73%
object with integer property..............................+15.4%
object with short string property.........................+0.91%
object with long string property..........................-4.17%
object with properties of different types.................-1.85%
simple object.............................................+4.47%
simple object with required fields........................+0.95%
object with const string property.........................+3.89%
object with const number property.........................+0.67%
object with const bool property...........................+0.42%
object with const object property........................+20.29%
object with const null property...........................-4.96%
Back to perf-array-end 1e26d39