For the record, you can also create scope without a closure using with (or let, if it's available.) for (var i = 1; i < 10; ++i) { with({i:i}) // let (

For the record, you can also create scope without a closure using with (or let, if it's available.) for (var i = 1; i < 10; ++i) { with({i:i}) // let (i=i) { setTimeout( function( ) { alert( i ) }, i * 250 ); } } will do what you intend. If let is available, for (let i = 1; etc. will do the same thing without the cruft.