# Priority in dispatch
**URL:** https://discourse.julialang.org/t/priority-in-dispatch/16065
**Category:** General Usage
**Created:** [October 9, 2018, 11:12am UTC](https://discourse.julialang.org/t/priority-in-dispatch/16065 "2018-10-09T11:12:52Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@mschauer](https://discourse.julialang.org/u/mschauer)
#### Post date: [October 9, 2018, 11:12am UTC](https://discourse.julialang.org/t/priority-in-dispatch/16065/1 "2018-10-09T11:12:52Z")
I have a famility of functions
```julia
b(t, x::T) =
```
called in a loop
```julia
for i in 1:n
t = t + dt
x = x + dt*f(t, x)
end
```
It turns out that sometimes I’d need the index `i` as well and I’d like to define
```julia
f((i,s)::Tuple, x) = f(s, x)
for i in 1:n
t = t + dt
x = x + dt*f((i,s), x)
end
```
Which creates ambiguity between all my `f(s, x::T)` and `f((i,s)::Tuple, x)`. Of course I could
play with the order of the arguments or use a different function name but just to be sure: is there a way do define
```julia
f((i,s)::Tuple, x) = f(s, x)
```
such it has higher priority than (say)
```julia
f(s, x::Float64)
```
but less than `f((i,s)::Tuple, x::Float64)`?
---
### Author:  [@kristoffer.carlsson](https://discourse.julialang.org/u/kristoffer.carlsson)
#### Post date: [October 9, 2018, 12:16pm UTC](https://discourse.julialang.org/t/priority-in-dispatch/16065/3 "2018-10-09T12:16:34Z")
Instead of doing dispatch, can’t you just use a branch?
```julia
function f(s, x)
s isa Tuple && return _f(s[2], x)
return _f(s, x)
end
_f(s, x::Float64) = ...
```
---
### Author:  [@yha](https://discourse.julialang.org/u/yha)
#### Post date: [October 9, 2018, 2:28pm UTC](https://discourse.julialang.org/t/priority-in-dispatch/16065/4 "2018-10-09T14:28:06Z")
Or using dispatch:
```julia
f((i,s)::Tuple, x) = f(s,x)
f(s,x) = _f(s,x)
_f(s, x::Float64) = ...
_f(s, ...) = ...
```