### Author:  [@Jon\_Barker](https://discourse.julialang.org/u/Jon_Barker)
#### Post date: [March 16, 2022, 2:18pm UTC](https://discourse.julialang.org/t/why-does-my-hash-function-return-a-different-value-to-the-built-in-hash-function/77973/1 "2022-03-16T14:18:35Z")
I copied the `hash` function code from here:
>
And ran it under J1.7 but I get different results. Why?
---
### Author:  [@Jon\_Barker](https://discourse.julialang.org/u/Jon_Barker)
#### Post date: [March 16, 2022, 2:24pm UTC](https://discourse.julialang.org/t/why-does-my-hash-function-return-a-different-value-to-the-built-in-hash-function/77973/3 "2022-03-16T14:24:58Z")
> [@lawless-m](#):
>
> `hash2(x::Any) = hash(x, zero(UInt))`
Your second line - that should be:
`hash2(x::Any) = hash2(x, zero(UInt))`
?
---
### Author:  [@lawless-m](https://discourse.julialang.org/u/lawless-m)
#### Post date: [March 16, 2022, 2:27pm UTC](https://discourse.julialang.org/t/why-does-my-hash-function-return-a-different-value-to-the-built-in-hash-function/77973/5 "2022-03-16T14:27:44Z")
Ok, let me rephrase that
I get the same
```julia
julia> hash2((1,2))
0xc04cd80fdd457cea
```
---
### Author:  [@Jon\_Barker](https://discourse.julialang.org/u/Jon_Barker)
#### Post date: [March 16, 2022, 2:30pm UTC](https://discourse.julialang.org/t/why-does-my-hash-function-return-a-different-value-to-the-built-in-hash-function/77973/6 "2022-03-16T14:30:29Z")
Still no clue why I don’t get that then:
```julia
hash2(x::Any) = hash2(x, zero(UInt))
hash2(@nospecialize(x), h::UInt) = Base.hash_uint(3h - objectid(x))
hash((1,2))==hash2((1,2))
```
---
### Author:  [@Jon\_Barker](https://discourse.julialang.org/u/Jon_Barker)
#### Post date: [March 16, 2022, 2:31pm UTC](https://discourse.julialang.org/t/why-does-my-hash-function-return-a-different-value-to-the-built-in-hash-function/77973/7 "2022-03-16T14:31:48Z")
Ah i saw you edited your post - OK good I’m not going crazy.
Anyone shed some light on this?
---
### Author:  [@pfitzseb](https://discourse.julialang.org/u/pfitzseb)
#### Post date: [March 16, 2022, 2:32pm UTC](https://discourse.julialang.org/t/why-does-my-hash-function-return-a-different-value-to-the-built-in-hash-function/77973/8 "2022-03-16T14:32:16Z")
There’s a special hash function for tuples:
```julia
julia> @which hash((1,2), zero(UInt))
hash(t::Tuple, h::UInt64) in Base at tuple.jl:417
```
---
### Author:  [@lawless-m](https://discourse.julialang.org/u/lawless-m)
#### Post date: [March 16, 2022, 2:32pm UTC](https://discourse.julialang.org/t/why-does-my-hash-function-return-a-different-value-to-the-built-in-hash-function/77973/9 "2022-03-16T14:32:55Z")
I even took hashing.jl, replaced all the `hash(` with `hash2(` and got the same result
---
### Author:  [@Jon\_Barker](https://discourse.julialang.org/u/Jon_Barker)
#### Post date: [March 16, 2022, 2:33pm UTC](https://discourse.julialang.org/t/why-does-my-hash-function-return-a-different-value-to-the-built-in-hash-function/77973/10 "2022-03-16T14:33:41Z")
`@which`
Everytime I post here I learn of a new helpful macro. Thanks!