Jquery checking if a value exists in array or not

Question

I believe this question will be fairly easy for the ones who played around with java script   jquery   var arr   new Array       map arr  function      if  this id    productID       this price   productPrice    else     arr push  id  productID  price  productPrice          I guess the code above explains what I want in really simple way  I would imagine this   map would work like this but unfortunately I couldn t get results with this   What is the most simple and elegant way to do this  Do I truly go through all array just to find if a key s value is there or not   Does Jquery has something like isset  array  key      EDIT  I tried to use inArray but it keeps adding object to array even if there is a match   if     inArray productID  arr   gt  -1       var number     inArray productID  arr      orderInfo number  price   parseFloat productPrice    else      orderInfo push  id productID  price parseFloat productPrice

User · Answer

jQuery has the inArray function   http   api jquery com jQuery inArray

User · Answer

http   api jquery com jQuery inArray   if    inArray  example   myArray     -1         found it

User · Answer

if    inArray  yourElement   yourArray   gt  -1                  yourElement in yourArray           code here          Reference  Jquery Array  The   inArray   method is similar to JavaScript s native  indexOf   method in that it returns -1 when it doesn t find a match  If the first element within the array matches value    inArray   returns 0

User · Answer

If you want to do it using  map   or just want to know how it works you can do it like this   var added false    map arr  function elementOfArray  indexInArray     if  elementOfArray id    productID       elementOfArray price   productPrice     added   true       if   added      arr push  id  productID  price  productPrice       The function handles each element separately  The  inArray   proposed in other answers is probably the more efficient way to do it

User · Answer

Try jQuery inArray    Here is a jsfiddle link using the same code   http   jsfiddle net yrshaikh SUKn2   The   inArray   method is similar to JavaScript s native  indexOf   method in that it returns -1 when it doesn t find a match  If the first element within the array matches value    inArray   returns 0  Example Code      lt html gt      lt head gt         lt style gt           div   color blue             span   color red       lt  style gt         lt script src  http   code jquery com jquery-latest js  gt  lt  script gt      lt  head gt      lt body gt             lt div gt  John  found at  lt span gt  lt  span gt  lt  div gt         lt div gt 4 found at  lt span gt  lt  span gt  lt  div gt         lt div gt  Karl  not found  so  lt span gt  lt  span gt  lt  div gt         lt div gt            Pete  is in the array  but not at or after index 2  so  lt span gt  lt  span gt         lt  div gt         lt script gt           var arr     4   Pete   8   John              var  spans      span              spans eq 0  text jQuery inArray  John   arr              spans eq 1  text jQuery inArray 4  arr              spans eq 2  text jQuery inArray  Karl   arr              spans eq 3  text jQuery inArray  Pete   arr  2           lt  script gt        lt  body gt   lt  html gt    Output     John  found at 3 4 found at 0  Karl  not found  so -1  Pete  is in the array  but not at or after index 2  so -1

[javascript] Jquery, checking if a value exists in array or not

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