How to find duplicate data is present in array of dictionary.

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Swift

I have array of dictionary. If duplicate data is present in the array of dictionary then a flag to be raised with the element name which is duplicate.

The array of dictionary is below:
[[project_code: 1, lob: lob_1], [project_code: 1, lob: lob_1], [project_code: 2, lob: lob_1], [project_code: 3, lob: lob_1]]

Here we need to loop through and find if same project_code and lob is same, then it would return which all project_code which are duplicate.

Duplicate data means the pair of project_code and lob value should be same.

In the above array, if we go through then it should return project_code : 1


If anyone can write a code in Swift ..

Thanks in Advance.