CODEWITHSUNDEEP
javascript
dogamoluy
dogamoluy

Reputation: 29

Cant understand why I'm getting the ReferenceError

obj = [{name: 'Elie'},{name: 'Tim'},{name: 'Elie'}]
function addKeyAndValue(arr,key,value) {
    newOne = [];
    arr.forEach(function(val,i,arr){
        newOne.push(arr[i].key = value);
    });
    return newOne;
}

I'm trying to pass an array of objects with key and value to add, like so: addKeyAndValue(obj, isItawesome, true)

and then I expect to get something like:

[{name: 'Elie', isItawesome: true},{name: 'Tim', isItawesome: true},{name: 'Elie', isItawesome: true}]

but I'm getting an error... can anyone explain why am I getting it, please?

Upvotes: 2

Views: 51

Answers (3)

Bartłomiej Gładys
Bartłomiej Gładys

Reputation: 4615

First of all, you have to use string, as key, so call your function in that way: 

addKeyAndValue(obj, 'isItawesome', true)

Secondly, you are pushing a value, not an object to your array in that place:

newOne.push(arr[i].key = value);

Change it into:

newOne.push({...val, [key]: value})

If you want to make it even better:

function addKeyAndValue(arr, key, value){
  return arr.map(el => ({...el, [key]: value });
}

Upvotes: 2

bugwheels94
bugwheels94

Reputation: 31950

You are calling the function incorrectly. Do

addKeyAndValue(obj, 'isItawesome', true)

Note that isItawesome is a string not a variable so you need to wrap it inside quotes

Upvotes: 1

Abslen Char
Abslen Char

Reputation: 3135

This should work

obj = [{name: 'Elie'},{name: 'Tim'},{name: 'Elie'}]

var result = obj.map(function(el) {
  var o = Object.assign({}, el);
  o.isItawesome = true;
  return o;
})


console.log(result);

Upvotes: 0

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