29 lines
1.1 KiB
JavaScript
29 lines
1.1 KiB
JavaScript
const require_median = require("./median.js");
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//#region src/math/medianBy.ts
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/**
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* Calculates the median of an array of elements when applying
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* the `getValue` function to each element.
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*
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* The median is the middle value of a sorted array.
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* If the array has an odd number of elements, the median is the middle value.
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* If the array has an even number of elements, it returns the average of the two middle values.
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*
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* If the array is empty, this function returns `NaN`.
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*
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* @template T - The type of elements in the array.
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* @param {T[]} items An array to calculate the median.
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* @param {(element: T) => number} getValue A function that selects a numeric value from each element.
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* @returns {number} The median of all the numbers as determined by the `getValue` function.
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*
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* @example
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* medianBy([{ a: 1 }, { a: 2 }, { a: 3 }, { a: 4 }, { a: 5 }], x => x.a); // Returns: 3
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* medianBy([{ a: 1 }, { a: 2 }, { a: 3 }, { a: 4 }], x => x.a); // Returns: 2.5
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* medianBy([], x => x.a); // Returns: NaN
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*/
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function medianBy(items, getValue) {
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const nums = items.map((x) => getValue(x));
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return require_median.median(nums);
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}
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//#endregion
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exports.medianBy = medianBy;
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