Javascript create dynamic variables based on array

Question

I have an object defined below.

var obj = { 'group': ['a', 'b'],
            'value': 10
          }

Please note that group array can have n values. This is just an example. I want to create dynamic variables with names in array and assign their sum equal to value i.e 10. So for this particular object I want the following result.

First create Variables
var a, b
Then assign a + b = 10

Similarly for n values in array, I want

var a,b, ...n
a+b+....+n = 10

Please add more detail. Is a=10 and b=0 what you want? It satisfies a+b=10. — str
– str, Commented Jun 21, 2017 at 6:46
why do you need that? you could use an object, as you already have and use it as a namwspace for the dynamic need. — Nina Scholz
– Nina Scholz, Commented Jun 21, 2017 at 6:47
What code did you try? Where is your problem? You should check stackoverflow.com/help/how-to-ask as this question is not "a valid stackoverflow" question — Esteban
– Esteban, Commented Jun 21, 2017 at 6:49
assing a+ b =10 What ? Why ? How ? What is your final goal ? — Weedoze
– Weedoze, Commented Jun 21, 2017 at 6:52

Kirill · Accepted Answer · 2017-06-21 07:10:14Z

1

I think you need a function in your object, if i understand you right

var obj = {
    group: [1, 2, 3],
    value: function(){
        return this.group.reduce((a, b) => a + b, 0);
    }
}

obj.value();//6

you can edit obj.group array and get new value of this array by calling function obj.value()

but if you mean(again not sure, cause it is hard to understand) to make this value from variables called "a", "b" and etc you can try this code

var a = 1;
var b = 2;

var obj = {
    group: ["a", "b"],
    value: function(){
        return this.group.reduce((v_prev, v_current) => v_prev + eval(v_current), 0);
    }
}

obj.value();//3

Not the best idea to use eval, but it works. This code will find the sum of variables "a" and "b"

answered Jun 21, 2017 at 7:10

Kirill

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Comments

farhadamjady · Accepted Answer · 2017-06-21 07:03:16Z

0

look at this code i think this would help you:

    var obj = {
    'group': [5, 5],
    'value':function(str){
       return this[str].reduce(add)
    }
};

function add(a,b){
  return a+b
}

console.log(obj.value('group'))

answered Jun 21, 2017 at 7:03

farhadamjady

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Comments

xGeo · Accepted Answer · 2017-06-21 07:08:23Z

0

You can use an object instead:

var obj = {
  'group': ['a', 'b'],
  'value': 10
}

var groupNames = obj.group,
  groupCount = groupNames.length,
  val = obj.value / groupCount, //divide the obj.value to total group count
  resultObj = {};

for (var i in groupNames) {
  resultObj[groupNames[i]] = val; //add properties to resultObj based on group name and assign its value
}

//you can use the object properties to access your "dynamically created variables"
for (var i in resultObj) {
  console.log('Your variable name is "' + i + '" and the value is ' + resultObj[i])
}

NOTE: It is not sure the logic on a + b + ... n = obj.val so, I have used average.

That is - obj.val / obj.groups.length.

answered Jun 21, 2017 at 7:08

xGeo

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