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// Immediate Invoked Function Expression
let result = [];
for (var i = 0; i < 5; i++) {
    result.push(function() {
        console.log(i);
    });
}

result[2]();
result[4]();

for (var i = 0; i < 5; i++) {
    (function() {
        var j = i;
        result.push(function() {
            console.log(j);
        });
    })();
}

result[2]();
result[4]();