Run results for: Array compaction

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.0 Safari/605.1.15

Browser: Safari 16

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
State machine	62190.0 Ops/sec
Simple loop	106833.1 Ops/sec
Simple loop (reduce)	381010.3 Ops/sec

Script Preparation code:

function trimAsterisks(data) {
  return data.reduce(
    ({ state, output }, val) =>
      val == '*'
        ? { state: '*', output }
        : { state: '', output: output.concat(state + val) },
    { state: '', output: [] }
  ).output;
}

function collapse(array) {
  const result = [];

  for (const [i, n] of array.entries()) {
    if (n !== '*') {
      result.push(array[i - 1] === '*' ? `*${n}` : n);
    }
  }

  return result;
}

function collapseReduce(array) {
  return array.reduce((a, n, i, { [i - 1]: prev }) => {
    if (n !== '*') {
      a.push(prev === '*' ? `*${n}` : n);
    }
    return a;
  }, []);
}

var data = [
  '0',
  '1',
  '2',
  '3',
  '4',
  '5',
  '6',
  '*',
  '*',
  '9',
  '10',
  '11',
  '12',
  '13',
  '14',
  '15',
  '16',
  '17',
  '18',
  '19',
  '20',
  '21',
  '22',
  '23',
  '24',
  '25',
  '26',
  '27',
  '28',
  '29',
  '30',
  '31',
  '32',
  '*',
  '34',
  '*',
  '36',
  '37',
  '*',
  '39',
  '40',
  '41',
  '42',
  '43',
  '44',
  '45',
  '46',
  '47',
  '48',
  '49',
  '50',
  '51',
  '52',
  '*',
  '54',
  '*',
  '56',
  '57',
  '58',
  '59',
  '60',
  '61',
  '62',
  '63',
  '64',
  '65',
  '66',
  '67',
  '68',
  '69',
  '70',
  '71',
  '72',
  '73',
  '*',
  '*',
  '*',
  '*',
  '78',
  '79',
  '80',
  '81',
  '82',
  '83',
  '84',
  '85',
  '86',
  '87',
  '88',
  '89',
  '*',
  '91',
  '92',
  '93',
  '94',
  '95',
  '*',
  '97',
  '*',
  '*',
];

Tests:

State machine
const result = trimAsterisks(data);
Simple loop
const result = collapse(data);
Simple loop (reduce)
const result = collapseReduce(data);

Run results for: Array compaction

State machine

Simple loop

Simple loop (reduce)