My goal is to create a piecewise function in Julia parsimoniously.

u(x,y) = y if x = 0

u(x,y) = y -1 if x \neq 0

I get the following:

```
julia> FC(x) = (x==0):(0):(1)
FC (generic function with 1 method)
julia> u(x,y) = y - FC(x)
u (generic function with 1 method)
julia> u(1,0)
ERROR: ArgumentError: step cannot be zero
Stacktrace:
[1] steprange_last(start::Int64, step::Int64, stop::Int64)
@ Base .\range.jl:221
[2] StepRange
@ .\range.jl:208 [inlined]
[3] StepRange
@ .\range.jl:263 [inlined]
[4] _colon
@ .\range.jl:24 [inlined]
[5] Colon
@ .\range.jl:22 [inlined]
[6] Colon
@ .\range.jl:10 [inlined]
[7] FC
@ .\REPL[3]:1 [inlined]
[8] u(x::Int64, y::Int64)
@ Main .\REPL[4]:1
[9] top-level scope
@ REPL[5]:1
```

Problem is I want the function `FC(x) = (x==0):(0):(1)`

to return 0 for x=0 and 1 for x\neq 0.

Instead of being an if/else statement, this function returns a `StepRange`

.

And yes I know how to do this the long way…