groupBy

function groupBy<T, K extends any>(arr: T[], keyFn: (item: T) => K)

Groups the elements of an array based based on a given criteria function.

const grouped = Utils.groupBy(['one', 'two', 'three'], str => str.length); // group by the length of the strings
// {3: ['one', 'two'], 5: ['three']} (one and two have 3 characters, three has 5 characters)

Parameter	Type	Optional	Description
arr	T[]	❌	The array to goup
keyFn	(item: T) => K	❌	The function that returns the key to group by

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