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Lodash _.uniqWith

Overview

The lodash _.uniqWith method is a function that creates a new array with unique values based on a provided comparator function. It takes two arguments: the first argument is the array to inspect for unique values, and the second argument is a comparator function used to compare array values.

The _.uniqWith method uses the comparator function to determine which values should be considered duplicates. If two values in the array are considered duplicates, only one of the values will appear in the new array.

The comparator function takes two arguments: the first argument is the value from the array being inspected, and the second argument is the value being compared. The function should return true if the two values are considered duplicates.

Here is an example use case of the _.uniqWith method:

const arr = [
  {id: 1, name: 'Bob'},
  {id: 2, name: 'Alice'},
  {id: 3, name: 'Alice'},
  {id: 4, name: 'Bob'}
];

const uniqueArr = _.uniqWith(arr, (a, b) => a.name === b.name);
console.log(uniqueArr);
// Output: [{id: 1, name: 'Bob'}, {id: 2, name: 'Alice'}]

In this example, the _.uniqWith method takes an array of objects and determines uniqueness based on the name value of each object. The resulting array contains only the unique objects, removing one of the Bob objects and one of the Alice objects.

Overall, the _.uniqWith method is a useful function for creating a new array of unique values based on a provided comparator function. It can help simplify complicated array manipulation logic and improve code readability.