add multiple key/value pairs to object from array javascript

Question

function arrayToList (arr){
    var dataStructure = null;
    for (var i = 0;i < arr.length; i++){
    dataStructure= {value: arr[i]};
    }
    return dataStructure;
}
arrayToList([1,2,3]);

I would simply like this function to create an object that like this:

dataStructure {
    value: 1;
    value: 2;
    value: 3;
}

So far my code keeps updating a singular value. I'm pretty sure I cannot have "value" (same name) multiple times, however, I failed at trying to change it to value, value1, value2, etc. as well

Thank you in advance, sorry newbie question

Answer 1

You can define object before for loop, use bracket notation to set property of object. You can also pass a second parameter to specify the the value to be concatenated to object properties.

 function arrayToList (arr, counter) { var dataStructure = {}; for (var i = 0;i < arr.length; i++, counter++){ dataStructure["value" + counter] = arr[i]; } return dataStructure; } var res1 = arrayToList([1, 2, 3], 1); var res2 = arrayToList([4, 5, 6], 4); console.log(res1, res2);

Answer 2

 function arrayToList (arr){ var dataStructure = {}; // data structure is initialized to an empty object for (var i = 0; i < arr.length; i++) { var key = "value" + i; // generate the key (or var key = "value" + (i + 1); if you want to start with value1, value2 ...) dataStructure[key] = arr[i]; // set the value of the key 'key' to arr[i] } return dataStructure; } var obj = arrayToList([1,2,3]); console.log(obj);