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Add Char * String and Char * Char #22532

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merged 10 commits into from
Jul 11, 2017
Merged

Add Char * String and Char * Char #22532

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c20972c
added char concat methods
Jun 25, 2017
c6dec74
added char concat methods
Jun 25, 2017
7ce7e1a
added more tests
Jun 25, 2017
7313f5d
condense methods
Jun 25, 2017
c377c83
update docstring
Jun 26, 2017
f9dd68c
add ...
Jun 26, 2017
7d557d2
Minor docstring improvement
ararslan Jun 30, 2017
df56a8f
Remove line
ararslan Jun 30, 2017
2fbec25
Merge branch 'master' into char_concat
ararslan Jun 30, 2017
a1577a1
Add back the ...
ararslan Jul 11, 2017
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15 changes: 8 additions & 7 deletions base/strings/basic.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -59,20 +59,21 @@ sizeof(s::AbstractString) = error("type $(typeof(s)) has no canonical binary rep
eltype(::Type{<:AbstractString}) = Char

"""
```
*(s::AbstractString, t::AbstractString)
```
*(s::Union{AbstractString, Char}, t::Union{AbstractString, Char}...)

Concatenate strings. The `*` operator is an alias to this function.

# Example
Concatenate strings and/or characters, producing a [`String`](@ref). This is equivalent
to calling the [`string`](@ref) function on the arguments.

# Examples
```jldoctest
julia> "Hello " * "world"
"Hello world"

julia> 'j' * "ulia"
"julia"
```
"""
(*)(s1::AbstractString, ss::AbstractString...) = string(s1, ss...)
(*)(s1::Union{Char, AbstractString}, ss::Union{Char, AbstractString}...) = string(s1, ss...)
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Aside from some of the linalg code, typically there isn't a space after the comma in Union. Probably best to keep consistency within this file and alike.


one(::Union{T,Type{T}}) where {T<:AbstractString} = convert(T, "")

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7 changes: 7 additions & 0 deletions test/strings/basic.jl
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Expand Up @@ -484,3 +484,10 @@ Base.endof(x::CharStr) = endof(x.chars)
# issue #12495: check that logical indexing attempt raises ArgumentError
@test_throws ArgumentError "abc"[[true, false, true]]
@test_throws ArgumentError "abc"[BitArray([true, false, true])]

@test "ab" * "cd" == "abcd"
@test 'a' * "bc" == "abc"
@test "ab" * 'c' == "abc"
@test 'a' * 'b' == "ab"
@test 'a' * "b" * 'c' == "abc"
@test "a" * 'b' * 'c' == "abc"