Question

162

setTimeout does not print consecutive numbers because of closure

rated 0 times [ 164] [ 2] / answers: 1 / hits: 21365 / 12 Years ago, thu, november 1, 2012, 12:00:00

Possible Duplicate:

setTimeout in a for-loop and pass i as value

for (var i = 0; i < 5; i++) {

    setTimeout(function (i) {

        console.log(this.i)

    }, 1000);

}

This prints 5 five times. How can I write the loop so that it prints 0, 1, 2, 3, 4?

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answered 12 Years ago muhammadbrandend · Accepted Answer

Wrap it in a self-executing closure:

for (var i = 0; i < 5; i++) (function(i) {

    setTimeout(function() {

        console.log(i)

     }, 1000);

})(i);

Note: the argument to the function-expression to setTimeout is not being used, so I took that out. Also, it's not good to use global variables. Create variables using the var keyword.

You also don't need this.i; simply use i.