@rxap/utilities/src/lib/array/unique.js

A collection of utility functions, types and interfaces.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.unique = unique;
/**
 * Creates a predicate function to determine uniqueness of elements in an array.
 * The uniqueness can be determined either by a comparison function or by specific keys of the objects.
 *
 * @template T The type of elements in the array. It can be any valid TypeScript type.
 *
 * @param {CompareTo<T> | Array<keyof T>} [compareToOrKeys=((a, b) => a === b)] - A comparison function that defines how two elements are compared
 * for equality or an array of keys to compare when working with objects.
 * @return {(value: T, index: number, self: T[]) => boolean} A predicate function that can be used to filter unique elements from an array.
 */
function unique(compareToOrKeys = ((a, b) => a === b)) {
    const compareTo = typeof compareToOrKeys === 'function' ? compareToOrKeys : (a, b) => {
        for (const key of compareToOrKeys) {
            if (a[key] !== b[key]) {
                return false;
            }
        }
        return true;
    };
    return (value, index, self) => self.findIndex(item => compareTo(value, item)) === index;
}
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