Check if value exists in the array AngularJS

Question

Currently I m using the forEach  -method of angular to check the new value with the array of objects  But that s the wrong approach because for example in the list are 20 objects  When I m creating an object with an existing article then the if-statement in forEach tells one time the article is existing and 19 times it isn t   The following code   var list        articlelist forEach function  val       list push val artNr         log info list     The articlelistcontains all 20 objects  For comparing I only need the artNr  Because when the User create a new article then should be an if-Statement to check if the added artNr is already exists    scope createItem   function  createItem      if list artNr     createItem artNr           scope message    artNr already exists                 The problem is  that list artNr returns me  undefined  because the list variable is an array      list output in console    Array   AB001    AB002    AB003    AB004         createItem output     Object   artNr   AB001   description   New Article         How can I compare the new created object with the array from the list variable

User · Accepted Answer

You could use indexOf function   if list indexOf createItem artNr      -1       scope message    artNr already exists        More about indexOf    http   www w3schools com jsref jsref indexof array asp https   developer mozilla org en docs Web JavaScript Reference Global Objects String indexOf

User · Answer

U can use something like this        function  field value              var newItemOrder  value               Make sure user hasnt already added this item         angular forEach arr  function item                if  newItemOrder    item value                    arr splice arr pop item                                submitFields push   field  field  value  value

User · Answer

You can use indexOf    Like   var Color     blue    black    brown    gold    var a   Color indexOf  brown    alert a     The indexOf   method searches the array for the specified item  and returns its position  And return -1 if the item is not found     If you want to search from end to start  use the lastIndexOf   method       var Color     blue    black    brown    gold        var a   Color lastIndexOf  brown        alert a     The search will start at the specified position  or at the end if no start position is specified  and end the search at the beginning of the array   Returns -1 if the item is not found

[javascript] Check if value exists in the array (AngularJS)

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