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Lodash _.uniq

Overview

The lodash _.uniq method is a popular utility function in JavaScript that creates a new array with unique values from an existing array. The method accepts a single argument, which is the array that needs to be processed. By default, the method considers each value in the array to be unique based on strict equality.

The lodash _.uniq method works by comparing each value in the input array with the previous values that have been processed. If a value is found to be equal to a previous value, it is ignored and not included in the resulting array. Only the unique values are included in the output. Additionally, the method preserves the order of the unique elements in the output array, which means that the first occurrence of a unique element in the input array is the one that will be included in the output array.

The lodash _.uniq method also supports an optional second argument that can be used to perform a custom comparison between values. This callback function should return a truthy value if two values are considered equal and a falsy value otherwise. This allows for more flexibility when determining which elements should be considered unique.

Here is an example of using the lodash _.uniq method:

const array = [1, 2, 2, 3, 3, 3, 4, 5, 5];
const uniqueArray = _.uniq(array);
console.log(uniqueArray); // [1, 2, 3, 4, 5]

In conclusion, the lodash _.uniq method is a useful utility function for working with arrays in JavaScript. It allows for the easy creation of a new array with unique values from an existing array and provides flexibility with a custom comparison function.