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e.g.
byte(-126) ==> new Byte(0x82) int("123") ==> new Integer(123) double("123.456") ==> new Double(123.456) char(65) ==> 'A' string([1,2,3]) ==> "[Ljava.lang.Object;@17a37c" format([1,2,3]) ==> "[1, 2, 3]"
isArray checks if the object is an array. isFunction checks if the object is a function. When narg is specified checks if it is a function with narg parameters. instanceof does the same as Java.
e.g.
isArray([1, 2]) ==> true isArray(null) ==> false