const data = [...Array(100000).keys()].map(e => "foo" + e)
const obj = {}
for (const v of data) {
obj[v] = v
}
for (const v of data) {
obj[v] = v + 1
}
for (const v of data) {
delete obj[v]
}
const obj = new Map()
for (const v of data) {
obj.set(v, v)
}
for (const v of data) {
obj.set(v, v + 1)
}
for (const v of data) {
obj.delete(v)
}