how to round to 2 decimal places with typescript?

Question

I need to write a function in TypeScript which can round a number to 2 decimal places. For example:

123.456 => should return 123.46

123.3210 => should return 123.32

Can you identify the TypeScript function that I can use to accomplish this? Alternatively, is there is a commonly used third party library used for this, then what library and function should I use?

Answer 1

You can use toFixed, it rounds but it returns a string. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toFixed

So your function body will most likely end up with something like

function round(num: number, fractionDigits: number): number {
    return Number(num.toFixed(fractionDigits));
}