Run results for: branched single/empty

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Firefox/102.0

Browser: Firefox 102

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
basic empty	115015464.0 Ops/sec
branched empty	28448310.0 Ops/sec
basic single	79613344.0 Ops/sec
branched single	18869338.0 Ops/sec
basic large	361752.4 Ops/sec
branched large	272696.1 Ops/sec

Script Preparation code:

function sumBasic(numbers) {
  let sum = 0;
  for (const number of numbers) {
    sum += number;
  }
  return sum;
}

function sumBranched(numbers) {
  let sum = 0;
  if (Array.isArray(numbers)) {
    for (const number of numbers) {
      sum += number;
    }
  } else if (numbers !== undefined) {
    sum = numbers;
  }
  return sum;
}

var singleArray = [10];
var emptyArray = [];
var largeArray = [...Array(1000).keys()];

Tests:

basic empty
sumBasic(emptyArray);
branched empty
sumBranched(undefined);
basic single
sumBasic(singleArray);
branched single
sumBranched(10);
basic large
sumBasic(largeArray);
branched large
sumBranched(largeArray);

Run results for: branched single/empty

basic empty

branched empty

basic single

branched single

basic large

branched large