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ES10 ES2019

字符串​

数组​

Array.flat()​

可以将多个数组快速展开

flat()
[1, 2, [3, 4]].flat(Infinity); // [1, 2, 3, 4]

image-20220325143906672

Array.flatMap()​

[1, 2, 3, 4].flatMap(a => [a**2]); // [1, 4, 9, 16]