Run results for: Symbol vs String property square bracket, loop 2

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser: Chrome 119

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

String sum

3.0M/s

Symbol sum

2.9M/s

String

2.8M/s

Symbol

2.8M/s

View exact numbers

Test name	Executions per second
✓ String sum	2,959,610 Ops/sec
Symbol sum	2,925,757 Ops/sec
String	2,823,161 Ops/sec
Symbol	2,816,764 Ops/sec

Script Preparation code:


var sym = [Symbol("key1"), Symbol("key2"), Symbol("key3"), Symbol("key4"), Symbol("key5"), Symbol("key6"), Symbol("key7"), Symbol("key8"), Symbol("key9"), Symbol("key0")];
var str = ["key1", "key2", "key3", "key4", "key5", "key6", "key7", "key8", "key9", "key0"]; 
var foo1 = {
  [sym[0]]: 0,
  [sym[1]]: 0,
  [sym[2]]: 0,
  [sym[3]]: 0,
  [sym[4]]: 0,
  [sym[5]]: 0,
  [sym[6]]: 0,
  [sym[7]]: 0,
  [sym[8]]: 0,
  [sym[9]]: 0,
};
var foo2 = {
  [str[0]]: 0,
  [str[1]]: 0,
  [str[2]]: 0,
  [str[3]]: 0,
  [str[4]]: 0,
  [str[5]]: 0,
  [str[6]]: 0,
  [str[7]]: 0,
  [str[8]]: 0,
  [str[9]]: 0
};

Tests:

Symbol
for(const k of sym) foo1[k] = 1;
String
for(const k of str) foo2[k] = 1;
Symbol sum
let sum = 0 for (const k of sym) sum += foo1[k];
String sum
let sum = 0 for (const k of str) sum += foo2[k];