Question

163

Use Intl.NumberFormat without rounding

rated 0 times [ 169] [ 6] / answers: 1 / hits: 10402 / 4 Years ago, tue, october 13, 2020, 12:00:00

I'm using Intl.NumberFormat to format numbers:

const formatter = new Intl.NumberFormat('en-US', {

    minimumFractionDigits: 1,

    maximumFractionDigits: 4,

    minimumSignificantDigits: 1,

    maximumSignificantDigits: 4

  })



formatter.format(0.99999) // results: '1'. desired result: '0.9999'

formatter.format(0.006393555) // results: '0.006394'. desired result: '0.006393'

formatter.format(0.9972620384752073) // results: '0.9973'. desired result: '0.9972'

formatter.format(12345.67) // results: '12,350'. desired result: '12,345.67'

formatter.format(200001) // results: '200,000'. desired result: '200,001'

As you can see the numbers are being rounded automatically, which is undesirable behavior in my case.

Is there a way to tell the formatter not to round?
I Didn't found any option or combination of options to achieve that.

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carlton

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answered 4 Years ago reesel · Accepted Answer

I don't think this is possible with current spec and there are few proposals for the new spec, but you can still use formatToParts method and add custom function to format number parts as you wish.

For your first use case it could look something like:

const trauncateFractionAndFormat = (parts, digits) => {

  return parts.map(({ type, value }) => {

    if (type !== 'fraction' || !value || value.length < digits) {

      return value;

    }

    

    let retVal = ;

    for (let idx = 0, counter = 0; idx < value.length && counter < digits; idx++) {

      if (value[idx] !== '0') {

        counter++;

      }

      retVal += value[idx];

    }

    return retVal;

  }).reduce((string, part) => string + part);

};

const formatter = new Intl.NumberFormat('en-US', {

  minimumFractionDigits: 0,

  maximumFractionDigits: 20

})



console.log(trauncateFractionAndFormat(formatter.formatToParts(0.99999), 4));

console.log(trauncateFractionAndFormat(formatter.formatToParts(0.006393555), 4));

console.log(trauncateFractionAndFormat(formatter.formatToParts(0.9972620384752073), 4));

console.log(trauncateFractionAndFormat(formatter.formatToParts(12345.67), 4));

console.log(trauncateFractionAndFormat(formatter.formatToParts(20001), 4));