javascript question 2 explication needed

Question

the code:
for( var j=0, i=4, j<5, j++) {
( function (i) {
setTimeout( function () {
console.log(i);
}, 1000)
}) (J)
}

the output is: 01234
can anyone explain how this code function?

Answer 1

The code you written contains many syntax errors. (J) is different from (j). Loop statements/expressions are seperated with semicolons, not commas. I will assume that it is written correctly.

(function(i){//do something with i})(j) is a self-invoking function, with i as the parameter name defined along with the function, while j is the argument passed to the function. The loop will output the value of j each iteration.