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55 lines
1.4 KiB
55 lines
1.4 KiB
4 weeks ago
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/**
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* Returns a function that checks if an elements index matches the given rule
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* highly optimized to return the fastest solution.
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*
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* @param parsed A tuple [a, b], as returned by `parse`.
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* @returns A highly optimized function that returns whether an index matches the nth-check.
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* @example
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*
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* ```js
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* const check = nthCheck.compile([2, 3]);
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*
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* check(0); // `false`
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* check(1); // `false`
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* check(2); // `true`
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* check(3); // `false`
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* check(4); // `true`
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* check(5); // `false`
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* check(6); // `true`
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* ```
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*/
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export declare function compile(parsed: [a: number, b: number]): (index: number) => boolean;
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/**
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* Returns a function that produces a monotonously increasing sequence of indices.
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*
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* If the sequence has an end, the returned function will return `null` after
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* the last index in the sequence.
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*
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* @param parsed A tuple [a, b], as returned by `parse`.
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* @returns A function that produces a sequence of indices.
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* @example <caption>Always increasing (2n+3)</caption>
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*
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* ```js
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* const gen = nthCheck.generate([2, 3])
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*
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* gen() // `1`
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* gen() // `3`
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* gen() // `5`
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* gen() // `8`
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* gen() // `11`
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* ```
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*
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* @example <caption>With end value (-2n+10)</caption>
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*
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* ```js
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*
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* const gen = nthCheck.generate([-2, 5]);
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*
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* gen() // 0
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* gen() // 2
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* gen() // 4
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* gen() // null
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* ```
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*/
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export declare function generate(parsed: [a: number, b: number]): () => number | null;
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//# sourceMappingURL=compile.d.ts.map
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