Incorrect Typescript parameter

Question

I'm trying to pass this TypeScript array to a function. I've tried a number of parameter types to make this compile, but none of them seem to work. Here's the array:

var driverTally = [
                    { driver: 'driver1', numEscorts: 0},
                    { driver: 'driver2', numEscorts: 0},
                    { driver: 'driver3', numEscorts: 0} 
                ];

doStuff(driverTally : Array<[string,number]>){ ... }

The compiler keeps saying : "Argument of type '{ driver: string; numEscorts: number; }[]' is not assignable to parameter of type '[string, number][]'.

Sajeetharan · Accepted Answer · 2018-05-27 01:36:05Z

3

You cna use any if you are not sure about the type,

doStuff(driverTally : any){ ... }

or create a Class of the following type

export class Driver {
   public string driver;
   public int numEscorts;
}

and then declare your array as,

driverstally : Driver[] = [
                    { driver: 'driver1', numEscorts: 0},
                    { driver: 'driver2', numEscorts: 0},
                    { driver: 'driver3', numEscorts: 0} 
                ];

and then pass it as,

doStuff(driverTally :Driver[] ){ ... }

answered May 27, 2018 at 1:36

Sajeetharan

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1 Comment

beh1 Over a year ago

I made a Driver class. I guess I should have just done that right away, but it bugged me that I couldn't get the type right for the function. Thanks.

POV · Accepted Answer · 2018-05-28 19:08:20Z

0

I recommend you to determine interface:

interface IDriver {
    drive: string;
    numEscorts: number;
}

Then declare array with initialization:

public drivers: IDriver[] = [];

After you can pass this array as function parameter:

doStuff(driverTally: IDriver[] ){ ... }

answered May 28, 2018 at 19:08

POV

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