word-number-converter/src/toNumber.js

A simple JavaScript library to convert numbers to words and words to numbers. Works in both Node.js and browser environments.

const WORDS_TO_NUM = {
    zero: 0, one: 1, two: 2, three: 3, four: 4, five: 5,
    six: 6, seven: 7, eight: 8, nine: 9, ten: 10,
    eleven: 11, twelve: 12, thirteen: 13, fourteen: 14,
    fifteen: 15, sixteen: 16, seventeen: 17, eighteen: 18, nineteen: 19,
    twenty: 20, thirty: 30, forty: 40, fifty: 50,
    sixty: 60, seventy: 70, eighty: 80, ninety: 90,
};

const MULTIPLIERS = {
    hundred: 100,
    thousand: 1000,
    lacs: 100000,
    million: 1000000,
    billion: 1000000000
};

export function toNumber(str) {
    const words = str.toLowerCase().replace(/-/, ' ').split(/\s+/);
    let result = 0;
    let current = 0;

    for (const word of words) {
        if (word === 'and') continue;
        if (WORDS_TO_NUM[word] !== undefined) {
            current += WORDS_TO_NUM[word];
        } else if (MULTIPLIERS[word]) {
            current *= MULTIPLIERS[word];
            if (MULTIPLIERS[word] >= 1000) {
                result += current;
                current = 0;
            }
        }
    }

    return result + current;
}