Run results for: Redundant Lookups

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser: Chrome 132

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Redundant	145407664.0 Ops/sec
Not Redundant	158383056.0 Ops/sec

Script Preparation code:

var testObject = {
  'reallyLongStringsProbably': 0,
  'anotherReallyLongStringProbably': 1,
  'shortString1': 2,
  'shortString2': 3,
  'shortString3': 4,
  'shortString4': 5,
  'shortString5': 6,
  'shortString6': 7,
  'shortString7': 8,
  'moreLongStringsThatArePrettyLong': 9,
  'moreLongStringsThatArePrettyLong2': 10,
  'moreLongStringsThatArePrettyLong3': 11,
  'moreLongStringsThatArePrettyLong4': 12,
};

function cacheLookupRedundant(name) {
  if (!testObject[name]) {
    testObject[name] = 13;
  }
  return testObject[name];
}

function cacheLookupNotRedundant(name) {
  let value = testObject[name];
  if (!value) {
    value = 13;
    testObject[name] = value;
  }
  return value;
}

Tests:

Redundant
cacheLookupRedundant('someStringThatsAParameter');
Not Redundant
cacheLookupNotRedundant('someStringThatsAParameter');

Run results for: Redundant Lookups

Redundant

Not Redundant