Appendix B. Built-in Functions

This appendix contains a list of the built-in functions (methods of the global object), discussed in Chapter 3, Functions.

Function	Description
parseInt()	Takes two parameters: an input object and radix; then tries to return an integer representation of the input. Doesn't handle exponents in the input. The default radix is 10 (a decimal number). Returns NaN on failure. Omitting the radix may lead to unexpected results (for example for inputs such as 08), so it's best to always specify it. > parseInt('10e+3'); 10 > parseInt('FF'); NaN > parseInt('FF', 16); 255
parseFloat()	Takes a parameter and tries to return a floating-point number representation of it. Understands exponents in the input. > parseFloat('10e+3'); 10000 > parseFloat('123.456test'); 123.456
isNaN()	Abbreviated from "Is Not a Number". Accepts a parameter and returns true if the parameter...