# JavaScript function to convert Indian currency numbers to words with paise support

We are required to write a JavaScript function that takes in a floating-point number up to 2 digits of precision.

The function should convert that number into the Indian current text.

For example −

If the input number is −

const num = 12500

Then the output should be −

const output = 'Twelve Thousand Five Hundred';

## Example

Following is the code −

const num = 12500;
const wordify = (num) => {
const single = ["Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine"];
const double = ["Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"];
const tens = ["", "Ten", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"];
const formatTenth = (digit, prev) => {
return 0 == digit ? "" : " " + (1 == digit ? double[prev] : tens[digit])
};
const formatOther = (digit, next, denom) => {
return (0 != digit && 1 != next ? " " + single[digit] : "") + (0 != next || digit > 0 ? " " + denom : "")
};
let res = "";
let index = 0;
let digit = 0;
let next = 0;
let words = [];
if (num += "", isNaN(parseInt(num))){
res = "";
}
else if (parseInt(num) > 0 && num.length <= 10) {
for (index = num.length - 1; index >= 0; index--) switch (digit = num[index] - 0, next = index > 0 ? num[index - 1] - 0 : 0, num.length - index - 1) {
case 0:
words.push(formatOther(digit, next, ""));
break;
case 1:
words.push(formatTenth(digit, num[index + 1]));
break;
case 2:
words.push(0 != digit ? " " + single[digit] + " Hundred" + (0 != num[index + 1] && 0 != num[index + 2] ? " and" : "") : "");
break;
case 3:
words.push(formatOther(digit, next, "Thousand"));
break;
case 4:
words.push(formatTenth(digit, num[index + 1]));
break;
case 5:
words.push(formatOther(digit, next, "Lakh"));
break;
case 6:
words.push(formatTenth(digit, num[index + 1]));
break;
case 7:
words.push(formatOther(digit, next, "Crore"));
break;
case 8:
words.push(formatTenth(digit, num[index + 1]));
break;
case 9:
words.push(0 != digit ? " " + single[digit] + " Hundred" + (0 != num[index + 1] || 0 != num[index + 2] ? " and" : " Crore") : "")
};
res = words.reverse().join("")
} else res = "";
return res
};
console.log(wordify(num));

## Output

Following is the output on console −

Twelve Thousand Five Hundred

Updated on: 11-Dec-2020

1K+ Views