JavaScript & Array groupBy All In One

Array.prototype.groupBy()

// Arrow function
groupBy((element) => { /* ... */ } )
groupBy((element, index) => { /* ... */ } )
groupBy((element, index, array) => { /* ... */ } )

// Callback function
groupBy(callbackFn)
groupBy(callbackFn, thisArg)

// Inline callback function
groupBy(function(element) { /* ... */ })
groupBy(function(element, index) { /* ... */ })
groupBy(function(element, index, array){ /* ... */ })
groupBy(function(element, index, array) { /* ... */ }, thisArg)

Array.prototype.groupByToMap()

refs

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/groupBy

https://developer.mozilla.org/en-US/docs/Glossary/Deep_copy

https://developer.mozilla.org/en-US/docs/Glossary/Shallow_copy

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