# Multi-line expressions
**URL:** https://discourse.julialang.org/t/multi-line-expressions/16096
**Category:** General Usage
**Created:** [October 10, 2018, 3:13am UTC](https://discourse.julialang.org/t/multi-line-expressions/16096 "2018-10-10T03:13:47Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@albi3ro](https://discourse.julialang.org/u/albi3ro)
#### Post date: [October 10, 2018, 3:13am UTC](https://discourse.julialang.org/t/multi-line-expressions/16096/1 "2018-10-10T03:13:47Z")
I remember being able to extend expressions over multiple lines without a problem in earlier versions of julia.
How do I wrap an expression over multiple lines now when it gets too long?
Particularly, I want to break at the equals sign below
```julia
for j in 2:Nz #copying the first layer into the entire cube
X[(Ncell*Ny*Nx*(j-1) .+(1:Ncell*Nx*Ny)),:] =X[1:Ncell*Nx*Ny,:] .+(j-1)*cM;
end
```
---
### Author:  [@stevengj](https://discourse.julialang.org/u/stevengj)
#### Post date: [October 10, 2018, 3:29am UTC](https://discourse.julialang.org/t/multi-line-expressions/16096/2 "2018-10-10T03:29:36Z")
Line breaks after `=` (or inside a parens, or after an binary operator like `.+`) are still fine.
---
### Author:  [@albi3ro](https://discourse.julialang.org/u/albi3ro)
#### Post date: [October 10, 2018, 4:00am UTC](https://discourse.julialang.org/t/multi-line-expressions/16096/3 "2018-10-10T04:00:41Z")
ahh, was doing the break before the =
silly mistake
---
### Author:  [@aitzkora](https://discourse.julialang.org/u/aitzkora)
#### Post date: [April 2, 2025, 1:48pm UTC](https://discourse.julialang.org/t/multi-line-expressions/16096/4 "2025-04-02T13:48:53Z")
Hi, I realize today, that if you use line breaks after `=`, the binary operator involved must be on that line. For instance, the following Juia code
```julia
N=4;z=zeros(N);
for i in eachindex(z)
z[i] = i^2-i
end
z2=similar(z)
for i in eachindex(z2)
z2[i] = i^2 -
i
end
z3=similar(z)
for i in eachindex(z3)
z3[i] = i^2
- i
end
[z z2 z3]
```
gives
```julia
4×3 Matrix{Float64}:
0.0 0.0 1.0
2.0 2.0 4.0
6.0 6.0 9.0
12.0 12.0 16.0
```
So using `-` on the following lines after a line breaks does not give the right answer
---
### Author:  [@Nathan\_Boyer](https://discourse.julialang.org/u/Nathan_Boyer)
#### Post date: [April 2, 2025, 2:30pm UTC](https://discourse.julialang.org/t/multi-line-expressions/16096/5 "2025-04-02T14:30:38Z")
Yes, in your example, `z3[i] = i^2` and `-i` are parsed and evaluated as separate expressions. (`-i` is evaluated in the loop but not saved to a variable.) If you want to write expressions this way, parentheses are your friend.
```julia
for i in eachindex(z3)
z3[i] = (i^2
- i)
end
```
I’ll amend what `@stevengj` wrote slightly:
> [@stevengj](#):
>
> Line breaks _immediately_ after `=` (or inside a parens, or _immediately_ after a binary operator like `.+`) are still fine.
---
### Author:  [@aitzkora](https://discourse.julialang.org/u/aitzkora)
#### Post date: [April 2, 2025, 2:39pm UTC](https://discourse.julialang.org/t/multi-line-expressions/16096/6 "2025-04-02T14:39:51Z")
Thanks!