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Initial check-in to mozilla tree: JSRef development is migrating from JSFUN13_BRANCH of /m/src repository to /m/pub
22 lines
370 B
JavaScript
22 lines
370 B
JavaScript
// The Y combinator, applied to the factorial function
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function factwrap(proc) {
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function factproc(n) {
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if (n <= 1) return 1
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return n * proc(n-1)
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}
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return factproc
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}
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function Y(outer) {
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function inner(proc) {
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function apply(arg) {
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return proc(proc)(arg)
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}
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return outer(apply)
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}
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return inner(inner)
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}
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print("5! is " + Y(factwrap)(5))
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