Run results for: es6 map access with string vs symbol keys.

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:135.0) Gecko/20100101 Firefox/135.0

Browser: Firefox 135

Operating system: Ubuntu

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Get string key from map with only string keys

1085.4M/s

Get symbol key from map with mixed string and symbol keys

704.9M/s

View exact numbers

Test name	Executions per second
✓ Get string key from map with only string keys	1,085,366,400 Ops/sec
Get symbol key from map with mixed string and symbol keys	704,939,264 Ops/sec

Script Preparation code:

var mapStringKeys = new Map([["one", true], ["two", true], ["three", true], ["four", true], ["five", true], ["six", true], ["seven", true], ["eight", true], ["nine", true], ["ten", true]]);
var mapStringAndSymbolKeys = new Map([["one", true], [Symbol("two"), true], ["three", true], [Symbol("four"), true], ["five", true], [Symbol("six"), true], ["seven", true], [Symbol("eight"), true], ["nine", true], [Symbol("ten"), true]]);

var eightSymbol = Symbol("eight")

Tests:

Get string key from map with only string keys
var value = mapStringKeys.get('eight');
Get symbol key from map with mixed string and symbol keys
var value = mapStringAndSymbolKeys.get(eightSymbol);