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6. 实现一个flat函数,接收一个depth参数 #6

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@senfish

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@senfish

实现一个flat函数,扁平化数组,接收一个arr数组和一个depth参数,如果不传,默认为1;

function flat (arr, depth) {
  
}

flat([1,[2,3,[4,5]]], 2);  // [1,2,3,4,5]
flat([1,[2,3,[4,5]]]);  // [1,2,3,[4,5]]

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