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30 lines
581 B
TypeScript
30 lines
581 B
TypeScript
//! test_output(4782)
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import assert from "../helpers/assert.ts";
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import range from "../helpers/range.ts";
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export default function main() {
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// TODO: Remove the temptation pull out this constant (optimization to eval
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// known expressions).
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const threshold = 10n ** 999n;
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const result = range(fibonacci())
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.indexed()
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.filter(([_, x]) => x > threshold)
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.first();
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assert(result !== undefined);
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return result[0];
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}
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function* fibonacci() {
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let fibLast = 1n;
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let fib = 0n;
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while (true) {
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yield fib;
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[fib, fibLast] = [fib + fibLast, fib];
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}
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}
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