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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>Javascript empty strings convert to 0</title> </head> <body> <script> alert(Number("10.5")); // returns 10.5 alert(Number(true)); // returns 1 alert(Number(false)); // returns 0 alert(Number(null)); // returns 0 alert(Number(" 123 ")); // returns 123 alert(Number(" ")); // returns 0 alert(Number("")); // returns 0 alert(Number("123e-1")); // returns 12.3 alert(Number("0xFF")); // returns 255 (hexadecimal representation) alert(Number("undefined")); // returns NaN alert(Number("null")); // returns NaN alert(Number("Hello World!")); // returns NaN </script> </body> </html>