Comparison of getting and setting speeds of Object vs. Map in Javascript (Map writes are very slow)

js_object_map_get_set_comparison.js

const testKeyName = 'foo'
const testAmount = 100000000
const obj = { [testKeyName]: 'bar' }
const map = new Map()
map.set(testKeyName, 'bar')

let objTestName = `Reading a property from obj ${testAmount} times`
console.time(objTestName)
for (let i = 0; i < testAmount; i++) {
  obj[testKeyName]
}
console.timeEnd(objTestName)

let mapTestName = `Reading a property from map ${testAmount} times`
console.time(mapTestName)
for (let i = 0; i < testAmount; i++) {
  map.get(testKeyName)
}
console.timeEnd(mapTestName)

objTestName = `Writing a property to obj ${testAmount} times`
console.time(objTestName)
for (let i = 0; i < testAmount; i++) {
  obj[testKeyName] = i
}
console.timeEnd(objTestName)

mapTestName = `Writing a property to map ${testAmount} times`
console.time(mapTestName)
for (let i = 0; i < testAmount; i++) {
  map.set(testKeyName, i)
}
console.timeEnd(mapTestName)