Type Conversion & Coercion

parseInt('1010', 2) returns 10. The second parameter to parseInt() specifies the radix (base) of the numeral system to be used. When the radix is 2, parseInt() interprets the string as a binary number. In binary, '1010' represents the decimal number 10 (1×2³ + 0×2² + 1×2¹ + 0×2⁰). This functionality allows parseInt() to parse numbers in different numeral systems. Common bases include 2 (binary), 8 (octal), 10 (decimal), and 16 (hexadecimal). If the radix is not specified, it defaults to 10, except when the string starts with '0x' or '0X' (interpreted as hexadecimal).