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Lodash _.compact

Overview

Introduction: The lodash _.compact method is a useful utility function that is part of the popular JavaScript utility library, Lodash. The _.compact method is used to create a new array with all the falsey values removed. Falsey values include null, undefined, 0, false, NaN, and an empty string ("").

Syntax: The syntax for using the _.compact method in Lodash is as follows:

_.compact(array)

Parameters: The _.compact method accepts a single parameter that is an array. This is the input array which contains the elements that are to be filtered.

Return Value: The _.compact method returns a new array with all the falsey values removed.

Examples: Here are a couple of examples to illustrate the usage of the _.compact method:

Example 1:

let array = [0, 1, false, 2, "", 3];
let result = _.compact(array);
console.log(result); // [1, 2, 3]

In this example, we have an array that contains several falsey values. When we pass this array to the _.compact method, it returns a new array with all the falsey values removed. The resultant array contains only the truthy values - 1, 2, and 3.

Example 2:

let names = ["Alice", "", "Bob", null, "Charlie", undefined];
let result = _.compact(names);
console.log(result); // ["Alice", "Bob", "Charlie"]

In this example, we have an array of names that contains some empty strings, null, and undefined values. When we pass this array to the _.compact method, it returns a new array with all the falsey values removed. The resultant array contains only the truthy values - "Alice", "Bob", and "Charlie".

Conclusion: The _.compact method is a useful utility function that can be used to filter out falsey values from an array. This method is part of the popular Lodash library and can be used with any JavaScript project. By using this method, developers can simplify their code and make it more readable and concise.