Arrays & Objects
Group By Polyfill
easyJS SpecificJS / TS6 tests
Problem Statement
Write a method or function `groupBy(array, fn)` that splits an array into an object grouped by the key returned from `fn(item)`.
Examples
Example:
groupBy([6.1, 4.2, 6.3], Math.floor) -> { '4': [4.2], '6': [6.1, 6.3] }JavaScript & TypeScript starter code included
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