var numStr = "99";
document.write("The initial " + typeof numStr + " is " + numStr);
document.write("<BR>");
var num = parseInt(numStr);
document.write("The converted  " + typeof num + " is " + num);

The script's output is:

The initial string is 99
The converted number is 99

If a non-integer numeric string is given to the function, it returns the nearest integer, as a number.

See more examples for using the parseInt() function in Column 46, A DOM-Based Snakes Game, Part I.

People who read this tip also read these tips:

• Rounding Numbers Up
• Operator Precedence
• The null Value
• The Bitwise XOR Operator
• Binary and Hexadecimal Notations