On Sun, Mar 17, 2013 at 2:43 AM, Claus Reinke <claus.rei...@talk21.com>wrote:
> Neither arguments.callee (not available in strict) nor let (clumsy to > use in expressions) are needed for self-reference > > var rec = (f) => f((...args)=>rec(f)(...args)); > > var f = (self)=>(n)=> n>1 ? n*self(n-1) : n; > > [1,2,3,4,5,6].map((n)=>rec(f)(**n)); > ...but then you have a function rec which self-references. Much better to use the Z combinator: f => (x => f(v => x(x)(v)))(x => f(v => x(x)(v))) which can be conveniently inlined into any expression where it's used: js> [1,2,3,4,5,6].map((n)=>(f => (x => f(v => x(x)(v)))(x => f(v => x(x)(v))))(self => n => n>1 ? n*self(n-1) : n)(n)); [1, 2, 6, 24, 120, 720] Obviously this is much better than arguments.callee. -j
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