How to Use NumberFormatter in Swift?

Represent numerical values the way you want

You don’t need to tell me how many times you have written something like this:

Using string interpolation is fine, but how do we make the previous operation more succinct?

Welcome the NumberFormatter class

Using NumberFormatter

Let’s instantiate a NumberFormatter and set its numberStyle property:

As we can see, we specified that we want a currency representation of our values.

Let’s quickly test some values:

We see the following printed in the console:

We can easily change the currency symbol to euro:

As a result we have euro values printed out:

What is great about the NumberFormatter class is that it provides many options for setting our target representation type:

Let’s change the numberStyle to .spellOut:

So we have our numbers spelled out in the console:

Wrapping Up

To learn more about NumberFormatter, visit the official Apple documentation:

Want to learn more about Swift? Feel free to check out my other articles:

• What Is the Difference Between Class and Static in Swift?
• What is the ~= Operator in Swift?
• What Is a Labeled Statement in Swift?
• Implement the Key-Value Observation in Swift 5
• What is the ExpressibleByIntegerLiteral Protocol in Swift?

Thanks for reading!