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 return false   Is there a way to stop underscore each        1 2 3   each function v       if  v  2  return   what

User · Answer

It s also good to note that an each loop cannot be broken out of     to   break  use   find instead    http   underscorejs org  each

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You can t break from the each method   it emulates the native forEach method s behavior  and the native forEach doesn t provide to escape the loop  other than throwing an exception    However  all hope is not lost  You can use the Array every method      From that link      every executes the provided callback function once for each element present in the array until it finds one where callback returns a false value  If such an element is found  the every method immediately returns false    In other words  you could do something convoluted like this  link to JSFiddle     1  2  3  4  every function n        alert n       return n     3        This will alert 1 through 3  and then  break  out of the loop   You re using underscore js  so you ll be pleased to learn that it does provide an every method   they call it every  but as that link mentions  they also provide an alias called all

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You can have a look to   some instead of   each    some stops traversing the list once a predicate is true  Result s  can be stored in an external variable     some  1  2  3   function v        if  v    2  return true       See http   underscorejs org  some

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

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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

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1 2 3   find function v       return v if  v  2

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Update     find would be better as it breaks out of the loop when the element is found   var searchArr     id 1 text  foo    id 2 text  bar     var count   0  var filteredEl     find searchArr function arrEl                  count   count  1                if arrEl id     1                      return arrEl                                   console log filteredEl     since we are searching the first element in the array  the count will be one console log count     output  filteredEl    id 1 text  foo     count  1      Old     If you want to conditionally break out of a loop  use   filter api instead of   each  Here is a code snippet  var searchArr     id 1 text  foo    id 2 text  bar     var filteredEl     filter searchArr function arrEl                      if arrEl id     1                          return arrEl                                          console log filteredEl     output   id 1 text  foo

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Maybe you want Underscore s any   or find    which will stop processing when a condition is met

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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

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Like the other answers  it s impossible  Here is the comment about breaker in underscore underscore issue  21

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worked in my case  var arr2     filter arr  function item       if   item    3   return item

[javascript] how to break the _.each function in underscore.js

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