Tuesday, 5 April, 2022 UTC
Summary
Every once in a while I learn about a JavaScript property that I wish I had known about years earlier —
valueAsNumber is one of them. The valueAsNumber provides the value of an input[type=number] as a Number type, instead of the traditional string representation when you get the value:/* Assuming an <input type="number" value="1.234" /> */ // BAD: Get the value and convert the number input.value // "1.234" const numberValue = parseFloat(input.value, 10); // GOOD: Use valueAsNumber input.valueAsNumber // 1.234
This property allows us to avoid
parseInt/parseFloat, but one gotcha with valueAsNumber is that it will return NaN if the input is empty.Thank you to Steve Sewell for making me aware of
valueAsNumber!PSA: number inputs have a `.valueAsNumber` property that you may find handy pic.twitter.com/1QwdAW16CC— Steve Sewell (@Steve8708) March 31, 2022
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