Print Object Value for Object Key; not working

d.healey

@ten7kur said in Print Object Value for Object Key; not working:

How can i access the arrays?

obj.BD or obj.SD, etc.

ten7kur

@d-healey said in Print Object Value for Object Key; not working:

@ten7kur said in Print Object Value for Object Key; not working:

How can i access the arrays?

obj.BD or obj.SD, etc.

keyArray2.push(obj[BD]);? ..ooops typo. I meant :

keyArray2.push(obj[k][BD]);

I cant get the keyArray2 to populate correct, its displaying the fist value from each category.. as before

const var SamplemapList_CAT1 = Content.getComponent("SamplemapList_CAT1");
const var SamplemapList_CAT2 = Content.getComponent("SamplemapList_CAT2");

// viewport list the items
SamplemapList_CAT1.set("useList", true);
SamplemapList_CAT2.set("useList", true);
const var keyArray = [];
const var keyArray2 = [];
const var keyArray3 = [];
    
// put under category
const var names = ["BD_Ludwig","BD_Xyz","SD_Tamba","SD_Xxx","HH_chris"]; 

     

// this will hold the samplenames sorted by category
     var obj = {};

     for(n in names)
         {
         // This splits the string into a list using the given separator
         var sp = n.split("_");

         var drm_category = sp[0];
         var drm_sampleName = sp[1];

         // We can check if the category is already used
         if(isDefined(obj[drm_category]))
             obj[drm_category].push(drm_sampleName); // append to the existing list
         else
             obj[drm_category] = [drm_sampleName]; // create a new list at the key
         }
		 
    for (k in obj)
    {
        //Lists CAT1
        keyArray.push(k);
         Console.print(k);
        
         //List CAT
        keyArray2.push(obj[k][BD]);
        keyArray3.push(obj[k][SD]);
        //keyArray2.push(k[obj]);
        Console.print(obj[k][BD]);
    }
    
 
    
    
// Update the viewports
SamplemapList_CAT1.set("items", keyArray.join("\n"));
SamplemapList_CAT2.set("items", keyArray2.join("\n"));

ten7kur

@ten7kur
Even in something simple like this code below , i cant get "a" to show all its contents; all it prints is "a" and its first value "10" + undefined parameter 0

const var o = {a:[10,11,12], b:14, c:15, d:16}

    for (k in o)
    {    
        Console.print(o[k][a]);
    }

If i do:

const var o = {a:[10,11,12], b:14, c:15, d:16}

    for (k in o)
    {    
        Console.print(o[k]);
    }

Then i get a print out of "[Array] 14 15 16"
What am i not understanding?
Thanks

Lindon

@ten7kur

so in your simple example:

You have an object called o

it has 4 attributes named a,b,c and d

you need to reference these attributes in the object

Console.print(o.a);

will print "Array"

Console.print(o.a[0]);

will print 10

Console.print(o.b);

will print 14

so if you want to iterate through the attributes of o

const var o = {a:[10,11,12], b:[14,22,77], c:[1,9,6,-415], d:[16,22,11,56]}


    for (k in o)
    {    
        // k will first hold a, then b then c then d
        var key = o[k];
        Console.print(key[0]);
    }

so this will print:
10
14
1
16

so with some better name vars

const var o = {a:[10,11,12], b:[14,22,77], c:[1,9,6,-415], d:[16,22,11,56]}

for (key in o)
{    
    // key will first hold a, then b then c then d
    var attrib = o[key];
    for (val in attrib)
    {
        Console.print(val);
    };
};

ten7kur

@Lindon said in Print Object Value for Object Key; not working:

const var o = {a:[10,11,12], b:[14,22,77], c:[1,9,6,-415], d:[16,22,11,56]}

for (key in o)
{    
    // key will first hold a, then b then c then d
    var attrib = o[key];
    for (val in attrib)
    {
        Console.print(val);
    };
};

Aha, i see.
Console is printing all the values!Great! But going back to my first example, i cant manage to display it in a viewport.
The array "attrib" only shows 1 value "chris"... Why? yet Console prints all??

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Content.makeFrontInterface(600, 500);
    
// =================== [ Samplemap Categories ] ================== //
const var SamplemapList_CAT1 = Content.getComponent("SamplemapList_CAT1");
const var SamplemapList_CAT2 = Content.getComponent("SamplemapList_CAT2");

// viewport list the items
SamplemapList_CAT1.set("useList", true);
SamplemapList_CAT2.set("useList", true);
const var keyArray = [];
//const var val1 = [];
    

// put under category
const var names = ["BD_Ludwig","BD_Xyz","SD_Tamba","SD_Xxx","HH_chris"]; 

    
// this will hold the samplenames sorted by category
     var obj = {};

     for (n in names)
         {
         // This splits the string into a list using the given separator
         var sp = n.split("_");

         var drm_category = sp[0];
         var drm_sampleName = sp[1];

         // We can check if the category is already used
         if(isDefined(obj[drm_category]))
             obj[drm_category].push(drm_sampleName); // append to the existing list
         else
             obj[drm_category] = [drm_sampleName]; // create a new list at the key
         }
		 
         
    for (k in obj)
    {
         //Lists CAT1
         keyArray.push(k);
         //Console.print(k);
        
         //List CAT2
         var attrib = obj[k];
         for (val in attrib)
         { 
            var val1 = val;
            Console.print(val1);
         }

    }
    
    
// Update the viewports
SamplemapList_CAT1.set("items", keyArray.join("\n"));
SamplemapList_CAT2.set("items", [val1].join("\n"));

Lindon

@ten7kur said in Print Object Value for Object Key; not working:

Aha, i see.
Console is printing all the values!Great!

No. its not, I think you maybe still not quite there...your code:

const var o = {a:[10,11,12], b:14, c:15, d:16}

    for (k in o)
    {    
        Console.print(o[k][a]);
    }

So Console is being asked to print something about o...

o[k][a]

-- so break this down:

o - the object
k - an attribute of o
a - huh?

as you move through your loop K contains the attribute - so first time through
o = your object
k = the first attribute of your object (which first time thru is an attribute called "a")
a = well who knows what this equals but it really should be pointing at an index - its important to realise that even though you've named your attribute "a" in your object theres no way for the code to get at "an attribute called a" unless you explicitly call it - maybe like this:

Console.print(o.a)

in the loop you are running the code has no idea that theres something called "a" in your object

So as you say "all it prints is "a" and its first value "10" + undefined parameter 0"

so Console.print essentially does this:

print o[k] -- so it prints "a"
print o[k][a] -- er there is no attribute called "a" on the output of o[k] so its undefined...so prints undefined...

All of your problems are (as far as I can see) based on not understanding arrays and objects in javascript - stop, slow down, go do an online javascript course (they're free) and you will be much better off...

d.healey

https://www.tutorialspoint.com/javascript/javascript_objects.htm
https://www.tutorialspoint.com/javascript/javascript_arrays_object.htm

ten7kur

@Lindon said in Print Object Value for Object Key; not working:

@ten7kur said in Print Object Value for Object Key; not working:
Aha, i see.
Console is printing all the values!Great!
No. its not, I think you maybe still not quite there...your code:
const var o = {a:[10,11,12], b:14, c:15, d:16}

    for (k in o)
    {    
        Console.print(o[k][a]);
    }
So Console is being asked to print something about o...

o[k][a]

-- so break this down:

o - the object
k - an attribute of o
a - huh?

as you move through your loop K contains the attribute - so first time through
o = your object
k = the first attribute of your object (which first time thru is an attribute called "a")
a = well who knows what this equals but it really should be pointing at an index - its important to realise that even though you've named your attribute "a" in your object theres no way for the code to get at "an attribute called a" unless you explicitly call it - maybe like this:

Console.print(o.a)

in the loop you are running the code has no idea that theres something called "a" in your object

So as you say "all it prints is "a" and its first value "10" + undefined parameter 0"

so Console.print essentially does this:

print o[k] -- so it prints "a"
print o[k][a] -- er there is no attribute called "a" on the output of o[k] so its undefined...so prints undefined...

All of your problems are (as far as I can see) based on not understanding arrays and objects in javascript - stop, slow down, go do an online javascript course (they're free) and you will be much better off...

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It is printing all values. Checkout my snippet.
Console.print(val1); prints everything! yet but var attrib only has 1 item, "chris". Thats what i dont understand...

Ok, will do more reading...
I got other work to do, so doing this when i can
Thanks!

d.healey

Here's a quick guide

//Objects store data in key/value pairs
var obj = {};

//The key is like an array index
var keyValuePair = {"key":"value"};

//Objects can store multiple key/value pairs
var multipleKeyValuePairs = {"key1":"value1", "key2":"value2"};

//Arrays don't have keys, they have indexes
var array = [];

//The first array index is always 0
var arrayWithValues = ["value1", "value2", "value3"];

//You can put an array inside an object.
var arrayInsideObject = {"key":["value1", "value2", "value3"]};

//To access the array inside the object you need to use the key
var arr = arrayInsideObject.key;

//You can also write it like this
arr = arrayInsideObject["key"];

//To access the contents of the array that's inside the object you need the key and the array index
var index = 0; //This is the index of the first item in the array, "value1"
var value = arrayInsideObject["key"][index];

ten7kur

@d-healey said in Print Object Value for Object Key; not working:

Here's a quick guide

//Objects store data in key/value pairs
var obj = {};

//The key is like an array index
var keyValuePair = {"key":"value"};

//Objects can store multiple key/value pairs
var multipleKeyValuePairs = {"key1":"value1", "key2":"value2"};

//Arrays don't have keys, they have indexes
var array = [];

//The first array index is always 0
var arrayWithValues = ["value1", "value2", "value3"];

//You can put an array inside an object.
var arrayInsideObject = {"key":["value1", "value2", "value3"]};

//To access the array inside the object you need to use the key
var arr = arrayInsideObject.key;

//You can also write it like this
arr = arrayInsideObject["key"];

//To access the contents of the array that's inside the object you need the key and the array index
var index = 0; //This is the index of the first item in the array, "value1"
var value = arrayInsideObject["key"][index];

Helped Alot!
Big thanks!
Even though i pretty much knew it all, your example really put it in perspective!

Print Object Value for Object Key; not working

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