The code mentioned above is incorrect: var value = " Hello World" ; setTimeout ( ( function ( randomValue ) { return function ( ) { console .log( randomValue); } }) ( randomValue), 1000 ); value = " End" ; It should have been : var value = " Hello World" ; setTimeout ( ( function ( randomValue ) { return function ( ) { console .log( randomValue); } }) (value), 1000 ); value = " End" ;