terbilang.js

terbilang.js

module.exports = function(number) {
    if (!number) {
        number = 0;
    }

    const angka = ['satu', 'dua', 'tiga', 'empat', 'lima', 'enam', 'tujuh', 'delapan', 'sembilan'];
    const base1000 = ['ribu', 'juta', 'miliar', 'triliun'];
    let spelled = [];
    let result = undefined;

    function reverse(arr) {
        let reversed = [];
        for (var n = arr.length - 1; n > -1; n--) {
            reversed.push(arr[n]);
        }
        return reversed;
    }

    if (number === 0) {
        spelled.push('nol');
    } else {
        number_str = number.toString();
        reversed = reverse(number_str);

        reversed.forEach(function(cur, idx) {
            const num = parseInt(cur);

            if (idx === 0 && num > 0) {
                spelled.push(angka[num - 1]);
            } else if ([1, 4, 7, 10, 13].indexOf(idx) > -1) {
                if (num > 0) {
                    if (num === 1) {
                        spelled.push('sepuluh');
                    } else {
                        spelled.push('puluh');
                        spelled.push(angka[num - 1]);
                    }
                }
            } else if ([2, 5, 8, 11, 14].indexOf(idx) > -1) {
                if (num > 0) {
                    if (num === 1) {
                        spelled.push('seratus');
                    } else {
                        spelled.push('ratus');
                        spelled.push(angka[num - 1]);
                    }
                }
            } else if ([3, 6, 9, 12].indexOf(idx) > -1) {
                if (num > 0) {
                    if (idx === 3 && num === 1 && !reversed[idx + 1]) {
                        spelled.push('seribu');
                    } else {
                        spelled.push(base1000[[3, 6, 9, 12].indexOf(idx)]);
                        spelled.push(angka[num - 1]);
                    }
                } else if ((reversed[idx + 1] && reversed[idx + 1] !== '0') || (reversed[idx + 2] && reversed[idx + 2] !== '0')) {
                    spelled.push(base1000[[3, 6, 9, 12].indexOf(idx)]);
                }
            }
        });
    }
    result = reverse(spelled)
        .toString()
        .replace(/sepuluh,satu/g, 'sebelas')
        .replace(/sepuluh,dua/g, 'dua belas')
        .replace(/sepuluh,tiga/g, 'tiga belas')
        .replace(/sepuluh,empat/g, 'empat belas')
        .replace(/sepuluh,lima/g, 'lima belas')
        .replace(/sepuluh,enam/g, 'enam belas')
        .replace(/sepuluh,tujuh/g, 'tujuh belas')
        .replace(/sepuluh,delapan/g, 'delapan belas')
        .replace(/sepuluh,sembilan/g, 'sembilan belas')
        .replace(/,/g, ' ');

    return result;
}