Working with vectors etc

Element membership

Is All of r in x?

all() can take function as first element: Ref: https://bkamins.github.io/julialang/2022/04/01/fast.html

f(x, r) = all(in(x), r) # function testing lookup speed

f([1,2,3,4], [1,2,3]) ## true

f([1,2,3], [1,2,3,4]) ## false

false

Simpler:

all([1,2,3] .∈  Ref([1,2,3,4])) ## true

all([1,2,3,4 ] .∈  Ref([1,2,3])) ## false

all(in.([1,2,3], Ref([1,2,3,4]))) ## true

true

For some reason all([1,2,3] .in Ref([1,2,3,4])) fails.

From docs (currying .∈):

all([1,2,3] .∈([1,2,3,4],)) ## true
all([1,2,3,4] .∈([1,2,3,],)) ## false

false

Using in looks a bit different:

all(in([1,2,3,4]).([1,2,3])) ## true
all(in([1,2,3]).([1,2,3,4])) ## false

false