数组合并

合并两个数组 方法1

const merge = (a, b) => a.concat(b);
merge([1, 2, 3], [1, 2, 3, 4]); // => [1, 2, 3, 1, 2, 3, 4];

合并两个数组 方法2

const merge = (a, b) => [...a, ...b];
merge([1, 2, 3], [1, 2, 3, 4]); // => [1, 2, 3, 1, 2, 3, 4];

合并两个数组并去除重复值 方法1

const merge = (a, b) => [...new Set(a.concat(b))];
merge([1, 2, 3], [1, 2, 3, 4]); // => [1, 2, 3, 4];

合并两个数组并去除重复值 方法2

const merge = (a, b) => [...new Set([...a, ...b])];
merge([1, 2, 3], [1, 2, 3, 4]); // => [1, 2, 3, 4];