Show the user a number rounded to two decimal places in JavaScript without altering its original precise value

Take for instance this decimal value:

let myDecimal = 117.049701384;

I need to display 117.05 to the user without altering the original precise value above.

I am aiming to replicate Excel's behavior with decimals, showing a number with two decimal places while preserving all the decimals for calculations.

The goal is to maintain a clean UI by avoiding lengthy decimal numbers, yet ensuring precision in mathematical operations. I could duplicate variables, but that seems cumbersome and tedious.

Is this achievable in Javascript?

This application utilizes Javascript and VueJS 2.x.

Thank you in advance.

javascriptvue.jsdecimalrounding

Answer №1

Sure thing, the toFixed() method is your friend.

Here's a quick example:

let num = 88.93758261;
console.log(num.toFixed(3)); // 88.938

Answer №2

Make sure to utilize this code snippet when sending the mydecimal value back to the user interface.

mydecimal.toFixed(2)

Answer №3

Is this the solution you were looking for?

document.querySelectorAll("span[data-value]")
  .forEach(span => span.textContent = (+span.dataset.value).toFixed(2)); // or the equivalent in VUE
<span data-value="117.049701384"></span><br/>
<span data-value="217.01384"></span>

Answer №4

If you're aiming for precision with rounding, the toFixed function is your go-to
If precision isn't crucial and you want a more flexible approach, using regEx is another option

let roundedNum = (117.049701384).toFixed(2)-0
let regexNum = (117.049701384+"").match(/([\d]+\.[\d]{0,2})/)[1]-0
console.log( "toFixed", roundedNum, "RegEx", regexNum );

The "-0" at the end is used to convert the result back into a number

Answer №5

To ensure that a variable retains a value that should not be altered at runtime, it is best practice to use the const keyword instead of let. By doing so, you can save time in the future. You can then format or convert your constant as needed when presenting it to the user.

// Define your constant
const myDecimal = 117.049701384

// Display rounded result to user
console.log(Math.round(myDecimal * 100) / 100);

// Your constant remains unchanged
console.log(myDecimal)

Answer №6

When reaching the conclusion, I utilized toFixed(2)-0 to present the data directly to the user without altering the original value. This approach allows me to maintain precision for any subsequent mathematical operations within the application.

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