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jrwebdev/useState.ts

Created February 13, 2019 03:47
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useState.ts
// inferred as number
const [value, setValue] = useState(0);
// explicitly setting the types
const [value, setValue] = useState<number | undefined>(undefined);
const [value, setValue] = useState<Array<number>>([]);
interface MyObject {
foo: string;
bar?: number;
}
const [value, setValue] = useState<MyObject>({ foo: 'hello' });
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