interface TicketTime {
startTime: string;
endTime: string;
}
interface TicketInfo {
id: number;
from: string;
to: string;
company: string;
price: number;
time: TicketTime;
duration: number;
connectionAmount: number | null;
}
type data = TicketInfo [];
let flightsDataList: data [
{
}, ]
I am puzzled by the appearance of this error and unsure how to resolve it.
One user suggested that all you needed to do was include an = in your flightsData object.
Here is the desired formatting:
interface FlightTime {
departure: string;
arrival: string;
}
interface FlightInfo {
id: number;
origin: string;
destination: string;
airline: string;
cost: number;
schedule: FlightTime;
duration: number;
connections: number | null;
}
type flightData = FlightInfo[];
let flightsData: flightData = [{
id: 0,
origin: "",
destination: "",
airline: "",
cost: 0,
schedule: {departure: "departureTime", arrival: "arrivalTime"},
duration: 0,
connections: null
}]
Short version: Ensure you include an = sign after declaring let flightsData: info.
In TypeScript, you can define types within the code itself. For example:
let label: string = 'something';
This snippet declares a variable called label with the type string and assigns it a string value.
You can also define more complex structures, such as an Array of strings:
let labels: string[] = ['something', 'something else'];
In your code, the word 'info' is defined as a type representing an Array of TicketInfo objects. You should use it like this:
let flightsData: info = [];
If you leave out the = symbol, you inadvertently create another type: an Array of info, which is essentially an Array of Arrays of TicketInfo objects:
let flightsData: info[];
Sometimes you can include additional information inside square brackets, which TypeScript can interpret. Consider the following example:
type info = TicketInfo ['id'];
In this scenario, we're not declaring an Array of TicketInfo objects. Instead, we're specifying the 'id' property of TicketInfo, which is a number, making the type info a number as well.
In your specific situation, the absence of the = sign in your code resembles the previous example, but using {} as an index (similar to 'id' in TicketInfo['id']) results in an error.
let flightsData: info [
{
}, ]
This syntax attempts to access the index {}, which is invalid within an Object. {} cannot be a valid index.
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