const urls = [
"http://x.com",
"http://y.com",
"http://z.com",
];
for (let j=0; j<urls.length; j++) {
setTimeout(function() {
console.log(urls[j]);
}, 3000);
}
I'm inserting this code snippet into the Chrome inspector. Surprisingly, it spits out a peculiar number followed by a brief pause before showing 3 'undefined' errors on the console.
Implementing closure in this scenario:
for (var j=0; j<linksList.length; j++) {
(function(j){
setTimeout(function() {
console.log(linksList[j]);
}, 3000);
})(j);
}
The issue arises because when the callback of `setTimeout` is executed, `j = linksList.length`, causing you to output:
console.log(linksList[ linksList.length ]);
This results in printing 'undefined' three times since linksList[ linksList.length ] doesn't exist at that index.
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