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dir01/flatten.spec.ts

Last active May 14, 2019 09:33
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flatten.spec.ts
const flatten = <T>(arr: T[][]): T[] => ([] as T[]).concat(...arr);
test("flatten", () => {
expect(flatten([[1], [2], [3, 4]])).toEqual([1, 2, 3, 4]);
});
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