26 lines
1.2 KiB
TypeScript
26 lines
1.2 KiB
TypeScript
/**
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* Splits an array into two groups based on a predicate function.
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*
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* This function takes an array and a predicate function. It returns a tuple of two arrays:
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* the first array contains elements for which the predicate function returns true, and
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* the second array contains elements for which the predicate function returns false.
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*
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* @template T - The type of elements in the array.
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* @param {T[]} arr - The array to partition.
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* @param {(value: T) => boolean} isInTruthy - A predicate function that determines
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* whether an element should be placed in the truthy array. The function is called with each
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* element of the array.
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* @returns {[T[], T[]]} A tuple containing two arrays: the first array contains elements for
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* which the predicate returned true, and the second array contains elements for which the
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* predicate returned false.
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*
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* @example
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* const array = [1, 2, 3, 4, 5];
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* const isEven = x => x % 2 === 0;
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* const [even, odd] = partition(array, isEven);
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* // even will be [2, 4], and odd will be [1, 3, 5]
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*/
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declare function partition<T>(arr: readonly T[], isInTruthy: (value: T) => boolean): [truthy: T[], falsy: T[]];
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export { partition };
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