# Detect space
**URL:** https://discourse.julialang.org/t/detect-space/44521
**Category:** New to Julia
**Created:** [August 7, 2020, 7:08pm UTC](https://discourse.julialang.org/t/detect-space/44521 "2020-08-07T19:08:47Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Fuad\_Sami](https://discourse.julialang.org/u/Fuad_Sami)
#### Post date: [August 7, 2020, 7:08pm UTC](https://discourse.julialang.org/t/detect-space/44521/1 "2020-08-07T19:08:47Z")
hi all
i try to detect space in string, if i have
> “Hello World , i need to detect the index i , in python i just look for if arr[i] ==” "
> put here it doesn’t work.
```julia
function lengthOfLastWord(arr)
i=length(arr)
count = 0
while i>=1 && arr[i] ==" "
print(arr[i])
i -=1
end
while i>=1 && arr[i] !=" "
i-=1
count +=1
end
return count
end
arr = "Hello World"
println(lengthOfLastWord(arr))
```
the output her = 11
it mean he reverse to the beginning and skip on the space between two word.
it should return 5
any help ? thanks a lot for u guys you are helping me a lot
---
### Author:  [@dilumaluthge](https://discourse.julialang.org/u/dilumaluthge)
#### Post date: [August 7, 2020, 7:14pm UTC](https://discourse.julialang.org/t/detect-space/44521/2 "2020-08-07T19:14:56Z")
> [@Fuad\_Sami](#):
>
> `arr[i] ==" "`
Maybe try this instead:
```julia
arr[i] == ' '
```
---
### Author:  [@Fuad\_Sami](https://discourse.julialang.org/u/Fuad_Sami)
#### Post date: [August 7, 2020, 7:19pm UTC](https://discourse.julialang.org/t/detect-space/44521/3 "2020-08-07T19:19:59Z")
work !
thanks
---
### Author:  [@dilumaluthge](https://discourse.julialang.org/u/dilumaluthge)
#### Post date: [August 7, 2020, 7:22pm UTC](https://discourse.julialang.org/t/detect-space/44521/4 "2020-08-07T19:22:33Z")
You also may be interested in the [`isspace`](https://docs.julialang.org/en/v1/base/strings/#Base.Unicode.isspace) function:
```julia
isspace(arr[i])
```
---
### Author:  [@lucas711642](https://discourse.julialang.org/u/lucas711642)
#### Post date: [August 7, 2020, 8:15pm UTC](https://discourse.julialang.org/t/detect-space/44521/5 "2020-08-07T20:15:11Z")
It is worth noting that [strings in Julia can use variable-length encoding](https://docs.julialang.org/en/v1/manual/strings/#Unicode-and-UTF-8-1), which means that `1:length(str) == collect(eachindex(str))` may be false.
For example, when applying your function to string `"hello ωrold"`, the result is a `StringIndexError`. A generic implementation of your function is:
```julia
function lengthOfLastWord(str)
i = findlast(isspace, str)
if i === nothing
length(str)
else
length(str, nextind(str, i), lastindex(str))
end
end
```