# Extract arguments type and defalut value from a Function
**URL:** https://discourse.julialang.org/t/extract-arguments-type-and-defalut-value-from-a-function/19505
**Category:** New to Julia
**Tags:** question
**Created:** [January 11, 2019, 5:21am UTC](https://discourse.julialang.org/t/extract-arguments-type-and-defalut-value-from-a-function/19505 "2019-01-11T05:21:49Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@orange\_si](https://discourse.julialang.org/u/orange_si)
#### Post date: [January 11, 2019, 5:21am UTC](https://discourse.julialang.org/t/extract-arguments-type-and-defalut-value-from-a-function/19505/1 "2019-01-11T05:21:49Z")
hello, everyone,
I want to extract arguments type and defalut value from a Function, but method() only give part of arguement type and no defalut value which are defined by function.
```julia
function hello(name::String="world";greet::String="nice day")
println("hello $name, $greet")
end
methods(hello)
```
will output this:
```julia
2 methods for generic function hello:
hello(name::String; greet) in Main at In[6]:2
hello() in Main at In[6]:2
```
Is there other ways to do this？
I am using julia1.0.2，thanks ~
Regards
---
### Author:  [@jandehaan](https://discourse.julialang.org/u/jandehaan)
#### Post date: [January 11, 2019, 5:53am UTC](https://discourse.julialang.org/t/extract-arguments-type-and-defalut-value-from-a-function/19505/2 "2019-01-11T05:53:47Z")
```julia
dump([m for m in methods(hello)])
```
shows information for both methods.
```julia
julia> [m for m in methods(hello)][1].roots[2]
"nice day"
```
But I have no idea if there is an official public API to get at this kind of info.
---
### Author:  [@jbrea](https://discourse.julialang.org/u/jbrea)
#### Post date: [January 11, 2019, 9:00am UTC](https://discourse.julialang.org/t/extract-arguments-type-and-defalut-value-from-a-function/19505/3 "2019-01-11T09:00:26Z")
I tried to address a similar problem with a macro recently.
See [here](https://discourse.julialang.org/t/retrieve-default-values-of-keyword-arguments/19320).
---
### Author:  [@orange\_si](https://discourse.julialang.org/u/orange_si)
#### Post date: [January 11, 2019, 9:12am UTC](https://discourse.julialang.org/t/extract-arguments-type-and-defalut-value-from-a-function/19505/4 "2019-01-11T09:12:37Z")
thanks very much~ then I tried this, it can get the name and greet default name, but no number argument.
```julia
function hello(name::String="world";greet::String="nice day",number::Int=3)
println("x")
end
methods(hello)
for m in methods(hello)
println(m.roots)
end
```
and output this
```julia
Any[Symbol("#hello#36"), "nice day", :hello, Symbol("In[35]")]
Any["world", :hello, Symbol("In[35]")]
```
---
### Author:  [@orange\_si](https://discourse.julialang.org/u/orange_si)
#### Post date: [January 11, 2019, 9:21am UTC](https://discourse.julialang.org/t/extract-arguments-type-and-defalut-value-from-a-function/19505/5 "2019-01-11T09:21:22Z")
@jandehaan @jbrea yes, I hoped there is a public API for this.