JavaScript Object declaration by combining two different keys

Question

I'm not sure if it's possible or not. So here I'm looking for an answer.

Is there any way to declare an object like:

var objectName = {
    key1      : 'value1',

    key2,key3 : 'value2;
}

I'm trying to combine key2 and key3 together.

Answer 1

If you don't want to assign the values like Patric Roberts says, create an array of keys and set the same value to those keys like so:

var obj = {};
obj['key1'] = 1;

// Array of keys
var arrayOfKeys = ['key2','key3','key4'];
// Common value for keys in array
var val = 2;

// Iterate the array
for(var k in arrayOfKeys) {
  obj[arrayOfKeys[k]] = val;
}
console.log(obj);

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You can also check this answer

Answer 2

You could use a slightly different approach, which will work on primitive values, too, by adding an object for keeping the same reference to different keys in the array. For example, you have a value object, like

temp = {
    value: 42
}

and an array, like

object = {
    key2: temp,
    key3: temp
}

then you can use the keys independently for the value of the referenced object.

To change the value, you need to address it with

object.key2.value = 2000;
console.log(object.key3.value); // 2000