Lodash _.parseInt() Method

What You’ll Learn

By the end of this tutorial, you’ll use Lodash’s _.parseInt() confidently in real string workflows.

What Is _.parseInt()?

_.parseInt() parses a string into an integer. It wraps the native parseInt() with lodash’s consistent API so you can pass it to _.map() and other functional helpers without binding issues.

📝 Syntax

_.parseInt(string, [radix])

Syntax Rules

• string — The string to parse into an integer.
• radix — Optional base (2–36); defaults to 10 in lodash.
• Return value — Integer or NaN when parsing fails.
• Partial parse — Stops at the first non-numeric character (like native parseInt).
• Functional use — Works as a callback: _.map(arr, _.parseInt).

import parseInt from "lodash/parseInt";

const value = _.parseInt("42", 10);
// -> 42

Examples Gallery

Practical _.parseInt() patterns with copy-ready code and interactive Try It Yourself labs.

const parsed = _.parseInt("42", 10);
console.log(parsed);
// -> 42

42

const parsed = _.parseInt("FF", 16);
console.log(parsed);
// -> 255

255

const strings = ["10", "20", "30"];
const numbers = _.map(strings, value => _.parseInt(value, 10));

console.log(numbers);
// -> [10, 20, 30]

[10, 20, 30]

const result = _.parseInt("abc", 10);
console.log(Number.isNaN(result));
// -> true

true

const price = _.parseInt("$50".replace("$", ""), 10);
// -> 50

50

const str = "42";
const native = parseInt(str, 10);
const lodash = _.parseInt(str, 10);
// both -> 42

Both approaches yield: 42

📝 Notes

• Always specify radix for user-facing parsing.
• Returns NaN when no valid digits are found.
• Stops parsing at the first non-numeric character (e.g. '42px' -> 42).
• Use _.isNaN() or Number.isNaN() to detect failed parses.
• For decimals use parseFloat() or Number().
• Works as a iteratee: _.map(strings, _.parseInt).

💡 Best Practices