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Table of contents
1.
Introduction
2.
Why This Function is Used
3.
Syntax, Parameter and Return Value
3.1.
Syntax: 
3.2.
Parameters:
3.3.
Return Value: 
4.
Examples 
4.1.
Checking Various Data Types for Emptiness:
4.2.
JavaScript
4.3.
Conditional Execution Based on Data Presence:
4.4.
Validating Function Arguments:
4.5.
JavaScript
4.6.
Filtering Non-Empty Values in a Collection:
4.7.
JavaScript
5.
Frequently Asked Questions
5.1.
How does _.isEmpty() differ from simply checking !value?
5.2.
Can _.isEmpty() detect empty functions or non-enumerable properties?
5.3.
Is _.isEmpty() suitable for checking non-object types?
6.
Conclusion
Last Updated: Mar 27, 2024
Easy

Lodash _.isEmpty() Method

Author Riya Singh
0 upvote

Introduction

Determining whether a data structure like an object, array, or string is empty is a common operation in programming. Lodash simplifies this check with the _.isEmpty() method. It provides a clear and consistent way to determine if a value has no enumerable properties or elements. 

Lodash _.isEmpty() Method

This method is especially useful in scenarios involving data validation, conditional rendering, or operations that depend on the presence of data.

Why This Function is Used

The _.isEmpty() function is used to check if a value is empty. This includes empty objects ({}), arrays ([]), strings (''), null, undefined, and similar data structures. It's a comprehensive check that covers a range of types, unlike native JavaScript methods which typically focus on a single type. This method helps to avoid errors and ensures that operations are not performed on data structures lacking content.

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Syntax, Parameter and Return Value

Syntax: 

_.isEmpty(value)

Parameters:

value: The value to check.

Return Value: 

(boolean) - Returns true if value is empty, else false.

Examples 

Checking Various Data Types for Emptiness:

  • JavaScript

JavaScript

var _ = require('lodash');

console.log(_.isEmpty({}));

console.log(_.isEmpty([]));

console.log(_.isEmpty(''));

console.log(_.isEmpty({ a: 1 }));

 Output: 

true (empty object)
true (empty array)
 true (empty string)
false (non-empty object)


Demonstrates _.isEmpty() applied to different data structures.

Conditional Execution Based on Data Presence:

function processData(data) {
  if (_.isEmpty(data)) {
    console.log('No data to process');
  } else {
    // Process data
  }
}


Shows using _.isEmpty() to conditionally process data.

Validating Function Arguments:

  • JavaScript

JavaScript

function greet(name) {

 if (_.isEmpty(name)) {

   return 'Hello, guest!';

 }

 return `Hello, ${name}!`;

}

console.log(greet(''));

Output: 

'Hello, guest!'


An example of validating function arguments for emptiness.

Filtering Non-Empty Values in a Collection:

  • JavaScript

JavaScript

var collection = [{}, { name: 'Alice' }, '', 'Hello'];

var nonEmptyItems = _.filter(collection, item => !_.isEmpty(item));

console.log(nonEmptyItems);

Output: 

[{ name: 'Alice' }, 'Hello']


Demonstrates filtering out empty items from a mixed collection.

Frequently Asked Questions

How does _.isEmpty() differ from simply checking !value?

Checking !value only tests for falsy values (like 0, null, undefined, ''). _.isEmpty() specifically checks for the absence of enumerable properties, which is a broader and more accurate check for emptiness.

Can _.isEmpty() detect empty functions or non-enumerable properties?

_.isEmpty() does not consider functions or non-enumerable properties in its check. It focuses on enumerable properties in objects and length in arrays and strings.

Is _.isEmpty() suitable for checking non-object types?

While _.isEmpty() works with non-object types like strings and arrays, its use with non-collection types (like numbers or boolean) is less meaningful and typically not recommended.

Conclusion

Lodash's _.isEmpty() method is a versatile tool for checking the emptiness of various data structures. It provides a more comprehensive and reliable check compared to native JavaScript methods, ensuring proper handling of data across different types and scenarios.

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