You have a 2d array {{1,2},{1,3},{5,6}}. Calculate the sum of elements of 1st position in every array with Java 8.
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Calculate sum of elements at 1st position in each array using Java 8.
Use Java 8 stream to map each array to its 1st element and then sum them up.
Example: {{1,2},{1,3},{5,6}} -> 1 + 1 + 5 = 7
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