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GingerBear/arr-filter-type-guard.ts

Created September 17, 2019 15:11
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TS arr filter type guard
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arr-filter-type-guard.ts
function notNullOrUndefined<T>(x: T | null | undefined): x is T {
return x !== null && x !== undefined;
}
const arr = [1, 2, null, undefined]; // (number | null | undefined)[]
const arrFiltered = arr.filter(notNullOrUndefined); // number[]
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