Oh yes, I think so! How do you like this?:

const memoizer = inits => rule =>{ const memo = [...inits] const elem = n => n >= memo.length ? memo[n] = rule(elem)(n) : memo[n] return elem } const fib = memoizer( [0, 1] )( a => n => a(n-1) + a(n-2) ) const oddFibG = function*(){ let i = 0 let value while (true){ value = fib(i) if (value % 2 === 1) yield value i = i + 1 } } const sumFibs = n => { let sum = 0 for ( const i of oddFibG() ) { if ( i > n ) return sum sum = sum + i } }

It's a little more complex, but very much faster than the above.

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Oh yes, I think so!

How do you like this?:

It's a little more complex, but very much faster than the above.