How to convert a string to an integer in JavaScript?

To convert a string to an integer in JavaScript, you can use methods like parseInt(), the unary + operator, or Number().

1. parseInt(): Converts a string to an integer, optionally specifying a radix (e.g., parseInt("42", 10)).
2. Unary +: Converts a string to a number, including integers (e.g., +"42").
3. Number(): Converts a string to a number, handling floats and integers (e.g., Number("42")).

Be cautious of invalid strings, as these methods return NaN if conversion fails. Always validate input before conversion to ensure reliable results.