Variables, Misc

Functions

isFinite(number)

• Determines if a number is finite; returns false if the argument is positive infinity, negative infinity, or NaN (not a number)

isNaN(testValue)

• Determines if the value is a not a number

escape(string)

• Returns the hexadecimal encoding of an argument in the ISO Latin character set

unescape(string)

• Returns the ASCII string for the specified hexadecimal encoding value
• escape and unescape are used primarily with server-side JavaScript to encode and decode name/value pairs in URLs

typeof()

• Returns: "number", "boolean", "string", "function", "object", "undefined"
• A null variable returns "object"

instanceof ()

(myObj instanceof MyClass)