Issue with accessing undefined property in Angular 2+ using Typescript

In my Angular 7 project, I am retrieving data from a service which looks like this:

{name: "peter", datetime: 1557996975991}
    

I have a method that is supposed to retrieve this data:

myMethod() {

        this.myService.getdata().subscribe((res) => {

            console.log(res); // returns: {name: "peter", datetime: 1557996975991}

            console.log(res[0].datatime); // Gives Error: Cannot read property 'datetime' of undefined 

        }); 

    }
    

However, when I attempt to access the 'datatime' value, I encounter this error:

Error: Cannot read property 'datetime' of undefined

How can I solve this issue?

Answer №1

The variable res is not an array, but an object.

In order to access the datetime property from res, you should modify your code to console.log(res.datatime);

Here is the corrected code:

myMethod() {

    this.myService.getdata().subscribe((res: any) => {

      console.log(res); // returns: {name: "peter", datetime: 1557996975991}

      console.log(res.datatime);

    }); 

}

Answer №2

extracting information from object, apply the following code snippet:

console.log(res.datetime)

Answer №3

It appears there may be some confusion between objects and arrays.

For example, using console.log(res[0].datatime), suggests an array structure when in fact the response is more like an object:

{name: "peter", datetime: 1557996975991}
.

Following Hein's suggestion, it would be more appropriate to access the datatime property with console.log(res.datatime)

Answer №4

print(res.datetime); - make sure to observe the e in question within the datetime.

Answer №5

Absolutely, as mentioned by @FailedUnitTest, declaring an interface is the most efficient way to access these values. It's wise to steer clear of using 'any' in your code, especially as it grows more complex, to avoid potential difficulties down the road.

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