Is There a Way to Break out of a forEach ?

[babbos]

Hello,

is there some way to break out of goog.array.forEach() ?

Thankyou

[Nathan Naze]

Nope. Use a for loop and the break keyword, or you could use
goog.array.some() -- the first time your function returns true, the
iteration will stop.

Nathan

[Erik Arvidsson]

You can use an exception to do this.

var stop = Error();

function func(n) {
if (n > 3) {
throw stop;
}
...
}

try {
goog.array.forEach([0, 1, 2, 3, 4, 5], func);
} catch (ex) {
if (ex !== stop) {
throw ex;
}
}

As you can see this is a lot of boiler plate code and if you have an
array it seems simpler to use a for loop. You might also want to take
a look at what goog.iter has to offer. It allows you to write:

goog.iter.forEach([0, 1, 2, 3, 4, 5], function(n) {
if (n > 3) {
throw goog.iter.StopIteration;
}
...
});

--
erik

[babbos]

Thankyou,

that was great advice!!

[Nathan Naze]

> On Feb 18, 10:15 am, Erik Arvidsson <erik.arvids...@gmail.com> wrote:
>> You can use an exception to do this.

Good point. I hadn't considered exception handling.

Nathan