# Boolean indexing deprecated?
**URL:** https://discourse.julialang.org/t/boolean-indexing-deprecated/7299
**Category:** General Usage
**Tags:** question, deprecation
**Created:** [November 25, 2017, 2:22am UTC](https://discourse.julialang.org/t/boolean-indexing-deprecated/7299 "2017-11-25T02:22:18Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@juliohm](https://discourse.julialang.org/u/juliohm)
#### Post date: [November 25, 2017, 2:22am UTC](https://discourse.julialang.org/t/boolean-indexing-deprecated/7299/1 "2017-11-25T02:22:19Z")
From the [NEWS.md](https://github.com/JuliaLang/julia/blob/master/NEWS.md) file:
> Using Bool values directly as indices is now deprecated and will be an error in the future. Convert them to Int before indexing if you intend to access index 1 for true and 0 for false.
Does that mean that we won’t be able to mask arrays with boolean masks anymore? That sounds terrible, can someone please clarify this?
---
### Author:  [@Keno](https://discourse.julialang.org/u/Keno)
#### Post date: [November 25, 2017, 2:25am UTC](https://discourse.julialang.org/t/boolean-indexing-deprecated/7299/2 "2017-11-25T02:25:23Z")
```julia
julia> a = [1,2]
2-element Array{Int64,1}:
1
2
julia> a[[false, true]]
1-element Array{Int64,1}:
2
julia> a[true]
WARNING: indexing with Bool values is deprecated. Convert the index to an integer first with `Int(i)`.
Stacktrace:
[1] depwarn(::String, ::Tuple{Symbol,Symbol,Symbol}) at ./deprecated.jl:68
[2] to_index at ./deprecated.jl:1854 [inlined]
[3] to_index at ./indices.jl:173 [inlined]
[4] to_indices at ./indices.jl:218 [inlined]
[5] to_indices at ./multidimensional.jl:512 [inlined]
[6] getindex(::Array{Int64,1}, ::Bool) at ./multidimensional.jl:372
[7] top-level scope
[8] eval(::Module, ::Expr) at ./repl/REPL.jl:3
[9] eval_user_input(::Any, ::Base.REPL.REPLBackend) at ./repl/REPL.jl:69
[10] macro expansion at ./repl/REPL.jl:100 [inlined]
[11] (::getfield(Base.REPL, Symbol("##1#2")){Base.REPL.REPLBackend})() at ./event.jl:95
in expression starting at no file:0
1
julia> a[false]
ERROR: BoundsError: attempt to access 2-element Array{Int64,1} at index [0]
Stacktrace:
[1] getindex(::Array{Int64,1}, ::Bool) at ./multidimensional.jl:372
[2] top-level scope
```
---
### Author:  [@juliohm](https://discourse.julialang.org/u/juliohm)
#### Post date: [November 25, 2017, 2:27am UTC](https://discourse.julialang.org/t/boolean-indexing-deprecated/7299/3 "2017-11-25T02:27:31Z")
Thank you @Keno for clarifying the note in the NEWS, I was about to have a mental crisis 🙂
---
### Author:  [@system](https://discourse.julialang.org/u/system)
#### Post date: [November 26, 2017, 2:27am UTC](https://discourse.julialang.org/t/boolean-indexing-deprecated/7299/4 "2017-11-26T02:27:49Z")
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