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Implement Array Group By
Create a function that groups array elements based on a given key or callback function.
Example:
Input: [{age:20},{age:30},{age:20}]
Output: {20:[...],30:[...]}
Ensure function signatures match starter code to run test cases.
index.js
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Test Case #1
Input: [{"type":"a"},{"type":"b"},{"type":"a"}],type
Expected: {"a":[...],"b":[...]}