hd-utils/lib/utils/array/removeDuplicatesFromArr.js

A handy utils for modern JS developers

import deepCompareObjects from '../object/deepCompare';
/**
 * @example removeDuplicatesFromArr([1,2,1]) => [1,2]
 * @example removeDuplicatesFromArr([{a:1}, {a:1}, {a:2}], key:"a") => [{a:1},{a:2}]
 * @example removeDuplicatesFromArr([{a:1}, {a:1}, {a:2}], key:"", deepCompare:true) => [{a:1},{a:2}]
 */
export default function removeDuplicatesFromArr(arr = [], key, deepCompare) {
    if (!Array.isArray(arr))
        return [];
    if (!arr?.length)
        return arr;
    if (key?.length && !deepCompare) {
        return arr.filter((item, index, selfArr) => {
            if (typeof item === 'object' && item !== null) {
                return selfArr.findIndex(fItem => fItem[key] === item[key]) === index;
            }
            return selfArr.findIndex(fItem => fItem === item) === index;
        });
    }
    if (deepCompare) {
        return arr.filter((item, index, arr) => {
            return (arr.findIndex(x => deepCompareObjects(item, x)) === index);
        });
    }
    else {
        return Array.from(new Set(arr));
    }
}