If you’ve never used it before, Lodash is a javascript library that provides handy data manipulation extension methods for arrays/collections. There are multiple ways we can achive group by in the array of objects. Try running with --detectOpenHandles to find leaks. Underscore.js groupBy multiple values (6) . Property 'value' does not exist on type 'EventTarget & Element'. If you wanted to go all the way: var grouped = _.mapValues(_.groupBy(cars, 'make'), Error: Gradle project sync failed. Write a program that asks the user to enter an integer and prints two integers, root and pwr, such that 0 < pwr < 6 and root**pwr is equal to the integer entered by the user. I’m using Underscore.js for its groupby function, which is helpful, but doesn’t do the whole trick, because I don’t want them “split up” but “merged”, more like the SQL group by method. 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