medianBy (for BigInts)

Returns the middle of the BigInts that a function derives from each element of an array.

const middle = medianBy(items, getValue);

INFO

This function is available exclusively from es-toolkit/bigint to avoid potential conflicts with similar functions for other numeric types.

Usage

medianBy(items, getValue)

Use medianBy when the BigInts you want the median of are inside objects. Pass a function that pulls the value out of each element, and it takes the median of everything that function returns.

import { medianBy } from 'es-toolkit/bigint';

const accounts = [{ balance: 10n }, { balance: 30n }, { balance: 20n }];
const middle = medianBy(accounts, account => account.balance);
console.log(middle); // 20n

Just like median, an even number of elements averages the two middle values and truncates toward zero, and an empty array throws.

import { medianBy } from 'es-toolkit/bigint';

const payments = [{ amount: 1n }, { amount: 2n }, { amount: 3n }, { amount: 4n }];
console.log(medianBy(payments, payment => payment.amount)); // 2n

medianBy([], () => 0n); // RangeError: Cannot compute the median of an empty array.

Parameters

• items (readonly T[]): The array of elements to calculate the median of.
• getValue ((element: T) => bigint): A function that returns the BigInt to use for each element.

Returns

(bigint): Returns the median of every value returned by getValue. For an even number of elements, returns the average of the two middle values, truncated toward zero.

Throws

Throws a RangeError if the array is empty.