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const startTimestamp = getMiliseconds(); | |
function getMiliseconds() { | |
return new Date(Date.now()).getMilliseconds(); | |
} | |
function getMillisecondsElapsed() { | |
return getMiliseconds() - startTimestamp; | |
} | |
function wait(timeout = 0) { | |
return new Promise((resolve) => setTimeout(resolve, timeout)); | |
} | |
const tasks = [ | |
() => wait(100).then(() => console.log("Task 1 finished at", getMillisecondsElapsed())), | |
() => wait(100).then(() => console.log("Task 2 finished at", getMillisecondsElapsed())), | |
() => wait(100).then(() => console.log("Task 3 finished at", getMillisecondsElapsed())), | |
]; | |
async function run(tasks = []) { | |
for (const task of tasks) { | |
await task(); | |
} | |
console.log("All tasks finished at", getMillisecondsElapsed()); | |
} | |
function runForEach(tasks = []) { | |
tasks.forEach(async (task) => { | |
await wait(100); | |
await task(); | |
}); | |
console.log("All tasks finished at", getMillisecondsElapsed()); | |
} | |
function runLongerForEach(tasks = []) { | |
tasks.forEach(async (task) => { | |
await wait(100); | |
await task(); | |
}); | |
console.log("All tasks finished at", getMillisecondsElapsed()); | |
} | |
function forEach() { | |
Array.prototype.forEach = function (callback) { | |
for (let i = 0; i < this.length; i++) { | |
callback(this[i], i, this); | |
} | |
}; | |
} | |
function patchForEach() { | |
Array.prototype.forEach = async function (callback) { | |
for (let i = 0; i < this.length; i++) { | |
await callback(this[i], i, this); | |
} | |
}; | |
} | |
async function runAsyncForEach(tasks = []) { | |
patchForEach(); | |
await tasks.forEach(async (task) => { | |
await task(); | |
}); | |
console.log("All tasks finished at", getMillisecondsElapsed()); | |
} | |
run(tasks); |
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