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@jbreckmckye
Created June 21, 2022 14:18
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Penalty of unnecessary async / await
async function addAwait (a, b) {
const resolved = await a
return a + b
}
function addOptimised (a, b) {
if (a instanceof Promise) {
return a.then(resolved => resolved + b)
} else {
return a + b
}
}
async function timeAwaited () {
const start = Date.now()
let val = 1
for (let i = 0; i < 999999; i++) {
val = addAwait(val, 1)
}
await val
const end = Date.now()
console.log('time awaited fn - ', end - start)
}
async function timeOptimised () {
const start = Date.now()
let val = 1
for (let i = 0; i < 999999; i++) {
val = addOptimised(val, 1)
}
await val
const end = Date.now()
console.log('time optimised fn -', end - start)
}
async function main() {
timeOptimised()
console.log('--------')
await timeAwaited()
}
main()
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