Javascript Array inside Array - how can I call the child array name

Question

Here is the example of what I am doing     var size   new Array  quot S quot    quot M quot    quot L quot    quot XL quot    quot XXL quot       var color   new Array  quot Red quot    quot Blue quot    quot Green quot    quot White quot    quot Black quot       var options   new Array  size  color    I am doing a loop select form thingies which work good  but I want to fetch the Array child name  in this case - size or color  When I am doing alert options 0    I get the whole elements of array  But for some specific case  I want to get only the array name  which is size color like I have said already  Is there way to achieve that

User · Answer

Yes it is  You can use   alert options 0  0     to get the size  S   or  alert options 0  1     to get the color  Red

User · Answer

Array is just like any other object  You can give it a name if you want   var size   new Array  S    M    L    XL    XXL    var color   new Array  Red    Blue    Green    White    Black    var options   new Array  size  color   color name    color   size name    size   options 0  name     size   gt true

User · Answer

you can get using key value something like this    var size   new Array  S    M    L    XL    XXL    var color   new Array  Red    Blue    Green    White    Black    var options   new Array size  color    var len   options length  for var i   0  i lt len  i         for var key in options i                alert options i  key              see here   http   jsfiddle net 8hmRk 8

User · Answer

There is no way to know that the two members of the options array came from variables named size and color   They are also not necessarily called that exclusively  any variable could also point to that array   var notSize   size   console log options 0       It is  size  or  notSize     One thing you can do is use an object there instead     var options         size  size      color  color     Then you could access options size or options color

User · Answer

I would create an object like this   var options          size    S    M    L    XL    XXL        color    Red    Blue    Green    White    Black        alert Object keys options      To access the keys individualy   for  var key in options        alert key       P S   when you create a new array object do not use new Array use    instead

User · Answer

In that case you don t want to insert size and color inside an array  but into an object  var options           size   size       color   color        Afterwards you can access the sets of keys by   var keys   Object keys  options

User · Answer

You ve made an array of arrays  multidimensional   so options 0  in this case is the size array  you need to reference the first element of the child  which for you is  options 0  0    If you wanted to loop through all entries you can use the for    in     syntax which is described here   var a    1 2 4 5 120 12   for  var val in t        console log t val       var b     S   M   L    var both    a b    for  var val in both         for val2 in both val   console log both val  val2

User · Answer

You can t  The array doesn t have a name   You just have two references to the array  one in the variable and another in the third array   There is no way to find all the references that exist for a given object   If the name is important  then store it with the data   var size     data    S    M    L    XL    XXL    name   size     var color     data    Red    Blue    Green    White    Black    name   color     var options    size  color     Obviously you ll have to modify the existing code which accesses the data  since you now have options 0  data 0  instead of options 0  0  but you also have options 0  name

[javascript] Javascript Array inside Array - how can I call the child array name?

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