CODEWITHSUNDEEP
javascript
Mohamed Hussain
Mohamed Hussain

Reputation: 7703

Undefined error in reading the property of object

Please help to solve the undefined error coming in my console while running the below code

Please see this JSbin also http://jsbin.com/ONOwujA/1/edit

data = [
    {key:"home",value:"hk1"},
    {key:"home",value:"hk2"},
    {key:"home",value:"hk3"},
    {key:"home",value:"hk4"},
    {key:"product",value:"pk1"},
    {key:"product",value:"pk2"},
    {key:"product",value:"pk3"},
    {key:"product",value:"pk4"},
    {key:"service",value:"sk1"},
    {key:"service",value:"sk2"},
    {key:"service",value:"sk3"},
    {key:"service",value:"sk4"}
];

myFilteredKey=[];
for(i=0;i<=data.length;i++){

    if(myFilteredKey.indexOf(data[i].key)!=-1){
        myFilteredKey.push(data[i].key);
        console.log(data[i].key);
    }
}

Upvotes: 0

Views: 37

Answers (1)

Felix Kling
Felix Kling

Reputation: 816414

Use i < data.length. If the length is 3, the maximum index is 2.

Another problem with your code is that no element will be added to myFilteredKey. Since the array is already empty, no element will satisfy the condition myFilteredKey.indexOf(data[i].key)!=-1. Maybe you want to use === -1 instead, i.e. check whether the element is not in the array rather than whether it's in the array.

Upvotes: 1

Related Questions