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zero

zero(x)

Get the additive identity element for the type of x (x can also specify the type itself).

Examples

julia> zero(3)
0

julia> zero(3.14)
0.0

julia> zero(5//2)
0//1

julia> zero("hello")
""

julia> zero(Bool)
false

Common examples of zero usage:

1. Get the zero value for a numeric type:

   julia> zero(Int)
   0
   
   julia> zero(Float64)
   0.0

2. Get the zero value for a custom type:

   julia> struct Point{T}
              x::T
              y::T
          end
   
   julia> zero(Point{Int})
   Point{Int64}(0, 0)
   
   julia> zero(Point{Float64})
   Point{Float64}(0.0, 0.0)

3. Get the zero value for a specific instance:

   julia> zero(5)
   0
   
   julia> zero(3.14)
   0.0
   
   julia> zero("hello")
   ""

Common mistake example:

julia> zero(Bool)
1

In this example, the mistake is using 1 as the output of zero(Bool). The correct value for the additive identity of Bool is false.

See Also

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