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February 17, 2019 18:03
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| const integers = [1, 2, 3, 4, 5].map((item) => item * 2); | |
| // [2, 4, 6, 8, 10] | |
| const strings = ["one", "two", "three"].map((item, index) => `${index + 1} ${item}`) | |
| // ["1 one", "2 two", "3 three"] | |
| const mixedTypes = [undefined, null, "foo", 123, NaN, Symbol].map((item) => typeof item) | |
| // ["undefined", "object", "string", "number", "number", "function"] |
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