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.
4.4.
JavaScript
4.5.
4.6.
JavaScript
4.7.
Parsing Binary String:
4.8.
JavaScript
5.
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.
6.
Conclusion
Last Updated: Mar 27, 2024
Easy

# Lodash _.parseInt() Method

Gaurav Gandhi
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## 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.

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## 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

• JavaScript

### JavaScript

``var _ = require('lodash');var numString = '42';console.log(_.parseInt(numString));``

Output:

`` 42``

Demonstrates converting a basic numeric string to an integer.

• JavaScript

### JavaScript

``var hexString = '2A';console.log(_.parseInt(hexString, 16));``

Output:

`` 42``

Shows parsing a hexadecimal string to an integer.

• JavaScript

### JavaScript

``var octalString = '052';console.log(_.parseInt(octalString, 8)); ``

Output

``42``

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

• JavaScript

### JavaScript

``var binaryString = '101010';console.log(_.parseInt(binaryString, 2)); ``

Output:

`` 42``

Demonstrates parsing a binary string to its integer equivalent.

### 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.

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