Skip to content
Draft
Changes from all commits
Commits
File filter

Filter by extension

Filter by extension

Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
45 changes: 45 additions & 0 deletions JavaScript/6-timeout-async_callback.js
Original file line number Diff line number Diff line change
@@ -0,0 +1,45 @@
'use strict';

// Wrapper will prevent call after timeout

const timeoutCallback = (delayCallback, fn) => {
// define flag
let killFlag = false;

const timeout = setTimeout(() => {
killFlag = true;
}, delayCallback);

return (...args) => {
const callback = args[args.length - 1];
if (typeof callback === 'function') {
args[args.length - 1].flag = killFlag;
timeout.close();
}
fn(...args);
};
};

// Usage

const fn = (par, callback) => {
console.log('Function called, par:', par);
if(!callback.flag) callback(null, par);
};

const fn100 = timeoutCallback(100, fn);
const fn200 = timeoutCallback(200, fn);

setTimeout(() => {
fn100('first', (err, data) => {
console.log('Callback', data);
});
fn200('second', (err, data) => {
console.log('Callback', data);
});
}, 150);

// console:
// Function called, par: first
// Function called, par: second
// Callback second