Created
September 6, 2019 07:20
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Understanding Discriminated Unions in Typescript
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function evaluatePrice(vehicle: Vehicle) { | |
switch(vehicle.vType) { | |
case "car": | |
return vehicle.transmission * evaluationFactor; | |
case "truck": | |
return vehicle.capacity * evaluationFactor; | |
case "motorcycle": | |
return vehicle.make * evaluationFactor; | |
case "bicycle": | |
return vehicle.make * evaluationFactor; | |
default: | |
const invalidVehicle: never = vehicle; | |
return throw new Error(`Unknown vehicle: ${invalidVehicle}`); | |
} | |
} |
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