mobility-toolbox-js/common/utils/removeDuplicate.js

Toolbox for JavaScript applications in the domains of mobility and logistics.

/**
 * This function remove duplicates lower case string value of an array.
 * It removes also null, undefined or non string values.
 *
 * @param {array} array Array of values.
 * @private
 */
const removeDuplicate = (array) => {
    const arrWithoutEmptyValues = array.filter((val) => val !== undefined && val !== null && val.trim && val.trim());
    const lowerCasesValues = arrWithoutEmptyValues.map((str) => str.toLowerCase());
    const uniqueLowerCaseValues = [...new Set(lowerCasesValues)];
    const uniqueValues = uniqueLowerCaseValues.map((uniqueStr) => arrWithoutEmptyValues.find((str) => str.toLowerCase() === uniqueStr));
    return uniqueValues;
};
export default removeDuplicate;