# Define function with begin or with let?
**URL:** https://discourse.julialang.org/t/define-function-with-begin-or-with-let/44767
**Category:** General Usage
**Created:** [August 11, 2020, 10:36pm UTC](https://discourse.julialang.org/t/define-function-with-begin-or-with-let/44767 "2020-08-11T22:36:38Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@PetrKryslUCSD](https://discourse.julialang.org/u/PetrKryslUCSD)
#### Post date: [August 11, 2020, 10:36pm UTC](https://discourse.julialang.org/t/define-function-with-begin-or-with-let/44767/1 "2020-08-11T22:36:38Z")
Consider these two functions
```julia
f(x) = begin
x^2
end
g(x) = let
x^2
end
using InteractiveUtils
@code_warntype f(1)
@code_warntype g(1)
```
The compiler seems to generate the same code for both functions. So my question is: is there any difference between these two?
---
### Author:  [@Henrique\_Becker](https://discourse.julialang.org/u/Henrique_Becker)
#### Post date: [August 11, 2020, 10:54pm UTC](https://discourse.julialang.org/t/define-function-with-begin-or-with-let/44767/2 "2020-08-11T22:54:43Z")
My question is why you would define your function this way instead of:
```julia
function f(x)
x^2
end
```
You are basically using the single-line syntax to define a multi-line function using a block to avoid the function scope being ended by the first newline found. If your intent is saving some keystrokes you could as well use parenthesis instead of `begin ... end` or `let ... end`.
```julia
f(x) = (
x^2
)
```
Probably there is no difference between the two forms, unless you actually use the `let` feature of allocating new bindings (by defining them in the same line as the `let` keyword).
---
### Author:  [@yuyichao](https://discourse.julialang.org/u/yuyichao)
#### Post date: [August 11, 2020, 10:59pm UTC](https://discourse.julialang.org/t/define-function-with-begin-or-with-let/44767/3 "2020-08-11T22:59:09Z")
Also, the compiler doesn’t care a little bit about syntax, the only thing matter is the scope. As long as the two version has identical scope behavior, which they do in this case and a slight generalization of this, they’ll be have the same.