radix.md

Pattern: Missing radix in parseInt

Issue: -

Description

Using parseInt() without specifying the radix can lead to unexpected results, especially when parsing strings with leading zeros. Always specify base 10 or the intended base to ensure consistent number parsing.

Examples

Example of incorrect code:

parseInt("071");      // 57 (interpreted as octal in some browsers)
parseInt("08");       // 0 (invalid in octal)
parseInt("0x16");     // 22 (interpreted as hex)
parseInt("15.5");     // 15

const str = userInput();
parseInt(str);

Example of correct code:

parseInt("071", 10);  // 71
parseInt("08", 10);   // 8
parseInt("0x16", 16); // 22 (explicitly hex)
parseInt("15.5", 10); // 15

const str = userInput();
parseInt(str, 10);