lib/chain/src/NumberUtils.js

import assert from "assert";

/**
    Convert 12.34 with a precision of 3 into 12340

    @arg {number|string} number - Use strings for large numbers.  This may contain one decimal but no sign
    @arg {number} precision - number of implied decimal places (usually causes right zero padding)
    @return {string} -
*/

const NumberUtils = {
    toImpliedDecimal: function toImpliedDecimal(number, precision) {
        if (typeof number === "number") {
            assert(number <= 9007199254740991, "overflow");
            number = "" + number;
        } else if (number.toString) number = number.toString();

        assert(
            typeof number === "string",
            "number should be an actual number or string: " + typeof number
        );
        number = number.trim();
        assert(
            /^[0-9]*\.?[0-9]*$/.test(number),
            "Invalid decimal number " + number
        );

        let [whole = "", decimal = ""] = number.split(".");

        let padding = precision - decimal.length;
        assert(
            padding >= 0,
            "Too many decimal digits in " +
                number +
                " to create an implied decimal of " +
                precision
        );

        for (let i = 0; i < padding; i++) decimal += "0";

        while (whole.charAt(0) === "0") whole = whole.substring(1);

        return whole + decimal;
    }
};

export default NumberUtils;