The document discusses the JavaScript utility library Lodash and whether it is needed. It notes that Lodash provides many useful functions but that modern JavaScript, including ES5 and ES6, include array and object methods that provide similar functionality to Lodash functions like map, filter, reduce, forEach, find, includes, merge, keys and values. The document recommends using built-in JavaScript methods over Lodash where possible but importing individual Lodash functions if a needed function is not supported by a target browser.