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juliaoperatorschain
Vinod
Vinod

Reputation: 4352

Chaining of operators with .|> in Julia

I have an expression

 [1:5;] .|> [x->x^2, inv, x->2*x, -, isodd]

taken from Julia documentation.

The output is

5-element Vector{Real}:
    1
    0.5
    6
   -4
 true

Can somebody explain the chain of operations on each elements 1:5 in detail. I did not understand why 1 is converted to 1 and 5 is converted to true.

Upvotes: 3

Views: 194

Answers (1)

Nils Gudat
Nils Gudat

Reputation: 13800

What you are doing is equivalent to:

julia> (x -> x^2)(1)
1

julia> inv(2)
0.5

julia> (x -> 2x)(3)
6

julia> -(4)
-4

julia> isodd(5)
true

i.e. you are broadcasting a container with five functions to it over a range with five elements. The first function is then applied to the first element of your range, the second function to the second element etc.

Upvotes: 5

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