Lodash _.compact() Function
Lodash proves to be much useful when working with arrays, strings, objects etc. It makes math operations and function paradigm much easier, concise. The _.compact() function is used to creates an array with all falsey values removed in JavaScript.
Syntax:
_.compact(array)
Parameters: This function accepts only a single parameter as mentioned above and described below:
- array: It is an array to be compacted.
Note: The values false, null, 0, “”, undefined, and NaN are falsey.
Return Value: This function returns the array after filtering the values.
Few examples are given below for a better understanding of the function.
Example 1: Passing a list of both the true and the false elements to _.compact() function.
javascript
// Requiring the lodash librarylet lodash = require("lodash"); // Original array to be compactedlet array = [0, 1, false, 2, '', 3]; let newArray = lodash.compact(array);console.log("Before compact: " + array); // Printing newArray console.log("After compact: " + newArray); |
Output:
Example 2: Passing a list containing all the false values to the _.compact() function.
javascript
// Requiring the lodash librarylet lodash = require("lodash"); // Original array to be compactedlet array = [0, false, '', undefined, NaN]; let newArray = lodash.compact(array);console.log("Before compact: " + array); // Printing newArray console.log("After compact: " + newArray); |
Output:
Example 3: Passing a list which contains a false element in â to _.compact() function.
javascript
// Requiring the lodash librarylet lodash = require("lodash"); // Original array to be compactedlet array = [false, 'HTML', NaN, 'CSS', 'undefined']; let newArray = lodash.compact(array);console.log("Before compact: " + array); // Printing newArray console.log("After compact: " + newArray); |
Output:
Example 4: Passing a list containing modified false values to the _.reduce() function.
javascript
// Requiring the lodash librarylet lodash = require("lodash"); // Original array to be compactedlet array = [false, true, 'yes', 'no', "no2"]; let newArray = lodash.compact(array);console.log("Before compact: " + array); // Printing newArray console.log("After compact: " + newArray); |
Output:
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