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 plus (+), or Number(). The parseInt() function parses a string and returns an integer, stopping at the first non-numeric character (e.g., parseInt("42abc") returns 42). The unary plus (+) is a shorthand for conversion, turning a numeric string like "42" into the integer 42. The Number() function also converts strings to numbers but returns NaN if the input is invalid (e.g., Number("42abc") returns NaN). Always validate inputs to handle unexpected or invalid strings gracefully.