Amount write in word

amount-in-word.js

const numberInWord = (amount) => {
    const units = ['', 'One', 'Two', 'Three', 'Four', 'Five', 'Six', 'Seven', 'Eight', 'Nine'];
    const teens = ['', 'Eleven', 'Twelve', 'Thirteen', 'Fourteen', 'Fifteen', 'Sixteen', 'Seventeen', 'Eighteen', 'Nineteen'];
    const tens = ['', 'Ten', 'Twenty', 'Thirty', 'Forty', 'Fifty', 'Sixty', 'Seventy', 'Eighty', 'Ninety'];
    const thousands = ['', 'Thousand', 'Million', 'Billion', 'Trillion']; // Extend as needed

    function convertThreeDigits(num) {
        const numStr = num.toString();
        const [a, b, c] = numStr.padStart(3, '0').split('').map(Number);

        let result = '';
        if (a > 0) {
            result += units[a] + ' Hundred ';
        }
        if (b === 1) {
            result += teens[c] + ' ';
        } else {
            result += tens[b] + ' ' + units[c] + ' ';
        }
        return result;
    }

    function convertToWords(amount) {
        if (amount === 0) {
            return 'Zero';
        }

        const amountStr = amount.toString();
        const chunks = [];

        for (let i = amountStr.length; i > 0; i -= 3) {
            chunks.push(amountStr.slice(Math.max(0, i - 3), i));
        }

        let words = '';
        for (let i = chunks.length - 1; i >= 0; i--) {
            const chunk = parseInt(chunks[i]);
            if (chunk === 0) continue;

            words += convertThreeDigits(chunk) + thousands[i] + ' ';
        }

        return words.trim();
    }

    return convertToWords(amount);
}