how to break the _.each function in underscore.js

Question

I\'m looking for a way to stop iterations of underscore.js _.each() method, but can\'t find the solution. jQuery .each() can break if you do

Answer 1

I believe if your array was actually an object you could return using an empty object.

_.({1,2,3,4,5}).each(function(v){  
  if(v===3) return {}; 
});

Answer 2

Update:

You can actually "break" by throwing an error inside and catching it outside: something like this:

try{
  _([1,2,3]).each(function(v){
    if (v==2) throw new Error('break');
  });
}catch(e){
  if(e.message === 'break'){
    //break successful
  }
}

This obviously has some implications regarding any other exceptions that your code trigger in the loop, so use with caution!

Answer 3

worked in my case

var arr2 = _.filter(arr, function(item){
    if ( item == 3 ) return item;
});

Answer 4

It's also good to note that an each loop cannot be broken out of — to break, use _.find instead.

http://underscorejs.org/#each

Answer 5

You cannot break a forEach in underscore, as it emulates EcmaScript 5 native behaviour.