var a = (123.456).toString(36) //"3f.gez4w97ry0a18ymf6qadcxr"

Now, how do I revert back to the original number using that string?

Note: parseInt(number,36) only works for integers.

var a = (123.456).toString(36) //"3f.gez4w97ry0a18ymf6qadcxr"

Now, how do I revert back to the original number using that string?

Note: parseInt(number,36) only works for integers.

• javascript
• numbers
• type-conversion

1 Answer 1

You could try parsing the integer and float parts separately with parseInt, as parseFloat does not support a radix:

function parseFloatInBase(n, radix) {
    var nums = n.split(".")

    // get the part before the decimal point
    var iPart = parseInt(nums[0], radix)
    // get the part after the decimal point
    var fPart = parseInt(nums[1], radix) / Math.pow(radix, nums[1].length)

    return iPart + fPart
}

// this will log 123.456:
console.log(parseFloatInBase("3f.gez4w97ry0a18ymf6qadcxr", 36))

I am dividing by radix ^ numLength because I am basically moving the decimal point over numLength spaces. You would do this just like in math class, because as you know dividing by 10 moves the decimal over one space, because most math is in base 10. Example:

123456 / 10 / 10 / 10 = 123.456

This is equivalent to

123456 / (10 * 10 * 10) = 123.456

And therefore

123456 / (10 ^ 3) = 123.456