Nested jQuery each - continue break

Question

Consider the following code       var sentences              Lorem ipsum dolor sit amet  consectetur adipiscing elit             Vivamus aliquet nisl quis velit ornare tempor             Cras sit amet neque ante  eu ultrices est             Integer id lectus id nunc venenatis gravida nec eget dolor             Suspendisse imperdiet turpis ut justo ultricies a aliquet tortor ultrices               var words     ipsum    amet    elit           sentences  each function             var s   this          alert s             words  each function i                if  s indexOf this   gt  -1                                alert  found     this                   return false                                      The interesting part is the nested jQuery each   loops  As per the documentation  returning false will break out of the loop  discontinuing execution of the loop - similar to a normal JavaScript break statement   and returning non-false will stop the current iteration and continue with the next iteration  similar to a normal JavaScript continue statement    I can break or continue a jQuery each   on its own  but with nested jQuery each  I ve found it difficult to break out of the parent loop from within the child loop  I could use a boolean value  and update it on every child iteration  but I was wondering if there was an easier way   I ve set up an example at jsFiddle if you d like to mess around with it  Simply click the  Test  button to run the example shown above   TLDR  Is there anything resembling a labeled continue or break within the context of jQuery

User · Answer

I ve used a  breakout  pattern for this     sentences  each function         var breakout      var s   this      alert s         words  each function i            if  s indexOf this   gt  -1                        alert  found     this               return breakout   false                        return breakout        This works nicely to any nesting depth  breakout is a simple flag  It will stay undefined unless and until you set it to false  as I do in my return statement as illustrated above   All you have to do is    declare it in your outermost closure  var breakout  add it to your return false statement s   return breakout   false return breakout in your outer closure s     Not too inelegant  right      works for me anyway

User · Answer

The problem here is that while you can return false from within the  each callback  the  each function itself returns the jQuery object  So you have to return a false at both levels to stop the iteration of the loop  Also since there is not way to know if the inner  each found a match or not  we will have to use a shared variable using a closure that gets updated   Each inner iteration of words refers to the same notFound variable  so we just need to update it when a match is found  and then return it  The outer closure already has a reference to it  so it can break out when needed     sentences  each function         var s   this      var notFound   true         words  each function             return  notFound    s indexOf this     -1                 return notFound        You can try your example here

User · Answer

You should do this without jQuery  it may not be as  pretty  but there s less going on and it s easier to do exactly what you want  like this   var sentences          Lorem ipsum dolor sit amet  consectetur adipiscing elit         Vivamus aliquet nisl quis velit ornare tempor         Cras sit amet neque ante  eu ultrices est         Integer id lectus id nunc venenatis gravida nec eget dolor         Suspendisse imperdiet turpis ut justo ultricies a aliquet tortor ultrices       var words     ipsum    amet    elit     for var s 0  s lt sentences length  s          alert sentences s        for var w 0  w lt words length  w              if sentences s  indexOf words w    gt  -1                alert  found     words w                return                      You can try it out here  I m not sure if this is the exact behavior you re after  but now you re not in a closure inside a closure created by the double  each   and you can return or break whenever you want in this case

User · Answer

There are a lot of answers here  And it s old  but this is for anyone coming here via google  In jQuery each function   return false  is like break    just   return  is like continue   These will emulate the behavior of break and continue

User · Answer

There is no clean way to do this and like  Nick mentioned above it might just be easier to use the old school way of loops as then you can control this  But if you want to stick with what you got there is one way you could handle this  I m sure I will get some heat for this one  But     One way you could do what you want without an if statement is to raise an error and wrap your loop with a try catch block   try    sentences  each function         var s   this      alert s         words  each function i            if  s indexOf this   gt  -1                        alert  found     this               throw  Exit Error                           catch  e        alert e      Ok  let the thrashing begin

User · Answer

You can break the   each   loop at a particular iteration by making the callback function return false    Returning non-false is the same as a continue statement in a for loop  it will skip immediately to the next iteration

User · Answer

Confirm in API documentation http   api jquery com jQuery each  say      We can break the   each   loop at a particular iteration by making the   callback function return false  Returning non-false is the same as a   continue statement in a for loop  it will skip immediately to the next   iteration    and this is my example http   jsfiddle net r6jqP    function             go   on  click  function            var i 0              all 0             li   each function                 all                 if     mytext   val     continue  return true               i                 if     mytext   val      this  html                      return false                                     alert  Iterazione     i   to   all             jQuery

User · Answer

Unfortunately no  The problem here is that the iteration happens inside functions  so they aren t like normal loops  The only way you can  break  out of a function is by returning or by throwing an exception  So yes  using a boolean flag seems to be the only reasonable way to  break  out of the outer  loop

User · Answer

Labeled Break  outerloop    sentences  each function            words  each function i                 break     breaks inner loop                 words  each function i                  break outerloop     breaks outer loop

User · Answer

As is stated in the jQuery documentation http   api jquery com jQuery each    return true in jQuery each is the same as a continue  return false is the same as a break

User · Answer

return true not work  return false working  found   false  query    foo        items   each function       if   this  text      query          found   true      return false

[jquery] Nested jQuery.each() - continue/break

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