Code360 powered by Coding Ninjas X Naukri.com. Code360 powered by Coding Ninjas X Naukri.com
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.
Basic Integer Parsing:
4.2.
JavaScript
4.3.
Parsing with Different Radix:
4.4.
JavaScript
4.5.
Handling Leading Zeros:
4.6.
JavaScript
4.7.
Parsing Binary String:
4.8.
JavaScript
5.
Frequently Asked Questions
5.1.
How does _.parseInt() differ from JavaScript's native parseInt()?
5.2.
What happens if the string cannot be converted to an integer?
5.3.
Is specifying the radix important?
6.
Conclusion
Last Updated: Mar 27, 2024
Easy

Lodash _.parseInt() Method

Author Gaurav Gandhi
0 upvote
Create a resume that lands you SDE interviews at MAANG
Speaker
Anubhav Sinha
SDE-2 @
12 Jun, 2024 @ 01:30 PM

Introduction

Parsing integers from strings is a common task in programming, especially when dealing with user input or data conversion. Lodash's _.parseInt() method enhances this functionality by providing a reliable way to convert a string to an integer, optionally allowing specification of the radix (base).

This method is particularly useful for handling numeric data that comes in string format, ensuring correct and consistent conversion to integers.

Why This Function is Used

The _.parseInt() function is used for converting a string representation of a number to an integer. While JavaScript's native parseInt() function serves a similar purpose, Lodash's version adds consistency and clarity, especially in cases where the radix might be variable or when dealing with potentially ambiguous data formats.

Get the tech career you deserve, faster!
Connect with our expert counsellors to understand how to hack your way to success
User rating 4.7/5
1:1 doubt support
95% placement record
Akash Pal
Senior Software Engineer
326% Hike After Job Bootcamp
Himanshu Gusain
Programmer Analyst
32 LPA After Job Bootcamp
After Job
Bootcamp

Syntax, Parameter and Return Value

Syntax:

 _.parseInt(string, [radix=10])

Parameters:

  • string (string): The string to convert.
     
  • [radix=10] (number): The base to parse the integer in (between 2 and 36).

Return Value: 

(number) - Returns the converted integer.

Examples 

Basic Integer Parsing:

  • JavaScript

JavaScript

var _ = require('lodash');

var numString = '42';

console.log(_.parseInt(numString));

Output:

 42


Demonstrates converting a basic numeric string to an integer.

Parsing with Different Radix:

  • JavaScript

JavaScript

var hexString = '2A';

console.log(_.parseInt(hexString, 16));

Output:

 42


Shows parsing a hexadecimal string to an integer.

Handling Leading Zeros:

  • JavaScript

JavaScript

var octalString = '052';

console.log(_.parseInt(octalString, 8));

Output

42


An example of correctly parsing an octal string by specifying the radix.

Parsing Binary String:

  • JavaScript

JavaScript

var binaryString = '101010';

console.log(_.parseInt(binaryString, 2));

Output:

 42


Demonstrates parsing a binary string to its integer equivalent.

Frequently Asked Questions

How does _.parseInt() differ from JavaScript's native parseInt()?

Lodash's _.parseInt() is similar to the native parseInt(), but it's often preferred for its readability and explicit radix handling. It also integrates seamlessly with other Lodash utilities.

What happens if the string cannot be converted to an integer?

If _.parseInt() encounters a string that cannot be converted to a valid integer, it returns NaN (Not a Number).

Is specifying the radix important?

Specifying the radix is important for accurately parsing strings with different number bases. For decimal strings, the radix can be omitted as it defaults to 10.

Conclusion

Lodash's _.parseInt() method is an effective tool for converting strings to integers, offering clarity and consistency, particularly when dealing with various number bases. It ensures accurate and reliable integer parsing, essential in many data processing and user input handling scenarios.

You can refer to our guided paths on the Coding Ninjas. You can check our course to learn more about DSADBMSCompetitive ProgrammingPythonJavaJavaScript, etc. 

Also, check out some of the Guided Paths on topics such as Data Structure and AlgorithmsCompetitive ProgrammingOperating SystemsComputer Networks, DBMSSystem Design, etc., as well as some Contests, Test Series, and Interview Experiences curated by top Industry Experts.

Previous article
Lodash _.add() Method
Next article
Lodash _.memoize() Method
Live masterclass