Type-conversion adheres to the following rules : Type Conversion « Number Data Type « JavaScript Tutorial

true is converted to the number 1 before being compared.

false is converted to 0 before being compared.

If either of the operands are NaN, the equality operator returns false.

null and undefined are equal.

null and undefined are not equal to 0 (zero), "" , or false.

If a string and a number are compared, attempt to convert the string to a number and then check for equality.

If an object and a string are compared, attempt to convert the object to a string and then check for equality.

If an object and a number are compared, attempt to convert the object to a number and then check for equality.

If both operands of an equality operation are objects, the addresses of the two objects are checked for equality.

Quote from:

Pure JavaScript (Paperback)

by R. Allen Wyke (Author), Jason Gilliam (Author), Charlton Ting (Author)

# Paperback: 1448 pages

# Publisher: Sams; 1st edition (August 1999)

# Language: English

# ISBN-10: 0672315475

# ISBN-13: 978-0672315473