Live programming @ University of Washington
Published
Edited
Dec 6, 2018
function pipe (A) {
return (f) => {
mutable count += 1 // (log when this function is evaluated)
if (!f) return A
return pipe(f(A))
}
}
// can be written briefly as f = A => g => g ? A : f(g(A))
// Usage:
// pipe(object)(a => b)(b => c)...(y => z)() // returns z
// useful for declarative programming pipelines
pipe('a')
(a => a + 'b')
(b => b + 'c')
(c => c + 'd')
()
{
// function evaluations are immediate, so we don't have to worry about stack overflow
mutable count = 0
const pipeline = pipe('a')
(a => a + 'b')
(b => b + 'c')
(c => c + 'd')
const prior_evaluations = mutable count
mutable count = 0
const output = pipeline()
const final_evaluations = mutable count
return [prior_evaluations, final_evaluations]
}
mutable count = 0
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