CODEWITHSUNDEEP
javascript
Allen
Allen

Reputation: 6882

What does this syntax mean which likes `functionName: {}`?

I have found a piece of code in my company's project like the following:

while(condition){        
        code...

        reloop: {
            if(somethingIsTrue) {
                break reloop;
            }
        }

        code...
}

I don't understand what reloop does, can anyone give a simple explanation?

Upvotes: 5

Views: 73

Answers (2)

salezica
salezica

Reputation: 76899

reloop: is a label. They are rarely used, and serve a very specific purpose: they let you break or continue outer loops from inner loops.

The article on MDN about labels explains this better.

Note that labels are very rarely used, and most of the time needing a label hints that your code is unclear, and should be restructured. I have never, not even once, used a label in javascript.

Avoid them unless they are truly the only clean solution to piece of code that proves difficult to write. Prefer, instead, splitting code into functions that you can return from.

Upvotes: 3

Chris Lear
Chris Lear

Reputation: 6732

reloop is a label for the block. The break command breaks out of the labelled block.

See eg https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/break

Upvotes: 2

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