question: degree of determinism

[jjangga0214]

Hi!

I wonder how strong the determinism is guaranteed.

For example,

• On the same version of Node.js.
• On the same browser.
• Across different versions of Node.js.
• Across different versions of browsers of the same kind.
• Across different kinds of browsers.
• Across JavaScript engines.
• Across JavaScript engines version.
• Is there special things to take care? To say, like floating point numbers and dates.
• etc

Thanks!!

[FunMiles]

I am also curious. I have full stack code. When computing the hash on the client, it does not match the one computed on the server. E.g. MD5 hashes:

• On the server, hash of V3YnvMxZAHSv+yLZTqWfdQ== for:

{
 fromCode: 'SJC',
 toCode: 'LAX',
 departureTime: 1715695200,
 duration: 5470,
 flight: 'AS-3445',
 classCode: 'F',
 seat: '2E',
 aircraft: null,
 registration: null,
 notes: null,
 status: 'A'
}

• On the client, hash of LUUV3I4vtEoqZ7gEvZi84g== for:

{
aircraft: null
classCode: "F"
departureTime: 1715695200
duration: 5470
flight: "AS-3445"
fromCode: "SJC"
notes: null
registration: null
seat:  "2E"
status: "A",
toCode:  "LAX"
} 

Both are obtained with hash(object, { algorithm: 'md5', encoding: 'base64' , unorderedObjects: true }).

PS: I found out what causes the issue. It is the difference of object prototype. To obtain the same hash, the following should be used: hash(object, { algorithm: 'md5', encoding: 'base64' , respectType: false }).

For basic untyped objects, it seems that it should by default ignore the prototype. It is also possible that some library code adds a function to prototype, so I would advocate that the default for respectType should be false, not true like it is right now. It seems less likely that a user would be surprised by the behavior if it is false, because if they turn on respectType, they will be made aware of the fact that the prototype is part of the hash.