DelayedEvaluation

DelayedEvaluation

This package extends the functionality of Base.Fix1 and Base.Fix2 to any function and provide a syntax to build DelayEval objects via delay for callable objects.

Usage

Use the function delay with : as a placeholders where arguments will be supplied on call. Examples:

delay(sin,1.0)() == sin(1.0)

delay(map,:,[1,2,3])(x->x+1) = map(x->x+1,[1,2,3])

delay(mapfoldl,x->x+1,:,[1,2,3])(*) == mapfoldl(x->x+1,*,[1,2,3])

Keyword arguments are also supported

delay(sort; by=x->x[1])([(2,:a),(1,:b)]) == sort([(2,:a),(1,:b)]; by=x->x[1])

delay(sort; by=x->x[1])([(2,:a),(1,:b)]; by=x->x[2]) == sort([(2,:a),(1,:b)]; by=x->x[2])

DelayEval <: Function, so composition also works

(first ∘ delay(getindex,:,2))([(1,:a),(2,:b)]) == first(getindex([(1,:a),(2,:b)],2))

and also indexing a DelayEval will create a new one

delay(delay(getindex,:,2),[(1,:a),(2,:b)])() == getindex([(1,:a),(2,:b)],2)

Broadcasting returns a container of DelayEvals:

   delay.(sin,[0.0,1.0]) == [delay(sin,0.0), delay(sin,1.0)]

Packages with similar functionality

FixArgs.jl ChainedFixes.jl