pankod/react-native-picker-modal-view

import { IModalListInDto } from '@Interfaces';

export const generateAlphabet = (items: IModalListInDto[], sortingLanguage?: string): Array<string> => {
    const singularAlpha = [];
    items.map((x: IModalListInDto) => {
        if (singularAlpha.indexOf(x.Name.charAt(0)) === -1) {
            singularAlpha.push(x.Name.charAt(0));
        }
    });

    if (sortingLanguage === 'tr') {
        return singularAlpha.sort((a, b) => trCompare(a, b));
    } else {
        return singularAlpha.sort((a, b) => a.localeCompare(b));
    }
}

// source https://gist.github.com/ugurozpinar/9682734
export const trCompare = (a: any, b: any): number => {
    const alphabets = 'AaBbCcÇçDdEeFfGgĞğHhIıİiJjKkLlMmNnOoÖöPpQqRrSsŞşTtUuÜüVvWwXxYyZz0123456789';
    if (a.length === 0 || b.length === 0) {
        return a.length - b.length;
    }
    for (let i = 0; i < a.length && i < b.length; i++) {
        const ai = alphabets.indexOf(a[i]);
        const bi = alphabets.indexOf(b[i]);
        if (ai !== bi) {
            return ai - bi;
        }
    }

    return 0;
}

export const getIndex = (alphabet: string, items: IModalListInDto[], autoSort: boolean, searchText: string): number => {
    const list = getFilteredData(items, autoSort, searchText);


    const findIndex = list.findIndex((x: IModalListInDto) => {
        return x.Name.charAt(0) === alphabet;
    });

    return findIndex;
}

export const getFilteredData = (items: IModalListInDto[], autoSort: boolean, searchText: string): IModalListInDto[] => {
    if (autoSort) {
        items.sort((a, b) => trCompare(a.Name, b.Name));
    }
    return items.filter((l: IModalListInDto) => l.Name.toLocaleLowerCase().indexOf(searchText.toLocaleLowerCase()) > -1);
}