What is the best method for ensuring that a value is displayed with 2 decimal points?

When I log the code snippet below in the console:

  const returnedValue = Array.from(
    { length: 2 / 0.25 },
    (_, i) => +((i + 1) * 0.25).toFixed(2),
  ).map((item) => ({ value: item, unit: "usd" }));

The output I receive is:

1: {value: 0.5, unit: 'usd'}
2: {value: 0.75, unit: 'usd'}
3: {value: 1, unit: 'usd'}
4: {value: 1.25, unit: 'usd'}
5: {value: 1.5, unit: 'usd'}
6: {value: 1.75, unit: 'usd'}
7: {value: 2, unit: 'usd'}

I need the values to be returned as numbers.

How can I modify the code to round all values to 2 decimal places, including 0.5, 1, 1.5, and 2?

Thank you.

Answer №1

Understanding the equivalence between 0.5 and 0.50 is straightforward, but representing this number in Javascript or typescript may not be as simple:

console.log(0.50)

If you wish to display this value with two decimal places, it's not a value issue, but rather a representation challenge. The solution lies in converting the number into a String, like so:

console.log(0.5.toFixed(2))

This implies that when transitioning from value to representation, use .toFixed(2), and when moving back from representation to value, utilize:

console.log(parseFloat("0.50"))

Yet, to simplify this process, consider storing the original value and convert to representation only when necessary. Assess your program structure to determine if this approach suits your needs.

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