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Manc/array-filter.ts

Created June 22, 2022 06:41
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Useful TypeScript code snippets
Raw
array-filter.ts
/**
* Filter array of mixed type elements narrowing down the resulting types,
* e.g. from `string | null` to just `string`.
*/
const mixedArray: Array<string|null> = ['a', 'b', null, ''];
const strings: string[] = mixedArray
.filter(
(value): value is string => typeof value === 'string'
);
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