A classic javascript (closure) interview question
for(var i =0; i<10; i++) {
setTimeout(function(){
console.log(i);
}, i);
}
//10 10times
for(let i =0; i<10; i++) {
setTimeout(function(){
console.log(i);
}, i);
}
// 0 - 9
for(var i =0; i<10; i++) {
setTimeout((function(j){
console.log(j);
})(i), i);
}
//0 - 9 because it's an immediately invoked function and this function returns null
for(var i =0; i<10; i++) {
setTimeout((function(j){
return function( ) {
// it doesn't need to go out all the way to i to find the variable.
// it stores the value j the moment the outer function gets executed
console.log(j);
}
})(i), i);
}
//0 - 9
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