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What are the ‘implements’ clauses in TypeScript? |
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Answer» An implements clause is used to check that a class satisfies the contract specified by an interface. If a class implements an interface and doesn’t IMPLEMENT that interface, the TypeScript compiler issues an error. interface Runnable {run(): void;}class Job implements Runnable {run() { console.log("RUNNING the scheduled job!");}}// Class 'Task' incorrectly implements interface 'Runnable'.// Property 'run' is missing in type 'Task' but required in type 'Runnable'.(2420)class Task implements Runnable {PERFORM() { console.log("pong!");}}A class can implement more than ONE interface. In this case, the class has to specify all the contracts of those interfaces. |
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