在JavaScript中的函数的循环中设置全局布尔变量的最佳语法

Question

So this is what I have right now:

            var flag = false;

            (function() {
                for (var i = 0; i < 5; i += 1) {
                    // some code ....
                    // How can I rewrite the following?
                    if (!flag) {
                        flag = true;
                        // can't break
                    }
                }
            })();

            console.log(flag);

http://jsfiddle.net/btc6wjw9/

My goal is set the flag to true when the function executes. What is the more elegant syntax with the same or better performance?

Thanks!

Update: I have since learned that changing a boolean value is faster than checking it: http://jsfiddle.net/xq7n7bry/

Answer 1

        var flag = false;

        (function() {
            for (var i = 0; i < 5; i += 1) {
                // some code ....
            }
            flag = true;
        })();

        console.log(flag);

I don't really understand the point of your question, but if you want to set it to true when the function is called, just set it to true when the function is called.

Answer 2

One way to rewrite:

if (!flag) {flag = true;}

is

flag = (!flag ? true: flag );

This is not necessarily better, as an assignment will be made at each iteration.