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const arr = ['a', 'b', 'c', 1, 2, 3].map((item) => { if (typeof item === 'number') { return item * 2; } }); console.log(arr); // => [undefined, undefined, undefined, 2, 4, 6] ã¿ãããªã±ã¼ã¹ã§ãundefinedãåé¤ãããå ´åãfilterã使ã£ã¦ã coâ¦
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