尾随点是否在Javascript中所有值均为零

Question

I want to remove 0s after dot

I'm using SQL with Laravel, in database the prices are stored using decimal(10,3) [I need 3 decimals].

From database I'm getting

400.000
451.500
1.522
20.000
300.210
143.100

I've tried to do parseFloat and toFixed(3), but it's not working how I'm expecting.

I expect the output to be:

400
451.500
1.522
20
300.210
143.100

The values are not from an array. I'm getting the value from an AJAX response. I'm clicking on a button and I'm getting 400.000, clicking again.. I'm getting in response 451.500, etc.

Answer 1

Using Array#filter and String#replace. Works by matching only 0's after the dot.

/\\.0+$/ is simple regex. It can be broken down into a few different parts. The outer / s (slashes) indicate that whatever within it is the regex.

The important part is actually, \\.0+$ . By default, . will match any character, but in this scenario we just want to find the numbers that contain a dot. So we escape it by using \\. .

Once, we have the numbers that contain a dot, we need to see if they contain one or more 0s and only 0s.

0+ will match at least one or more 0s.

$ ensures that the number ends in a 0.

tldr; Essentially. \\.0+$ will match anything that contains a . and has at least one 0 trailing and ends in a 0.

 const data = ['123.001','400.000', '451.500', '1.520', '20.000', '300.210', '143.100'] const res = data.map(n=>{ return n.replace(/\\.0+$/, ""); }); console.log(res); 

Answer 2

For simplicity sake, I turned your values into an array, however how you iterate over the values is up to you; here's the concept:

 let arr = [400.000, 451.500, 1.522, 20.000, 300.210, 143.100] for(let x = 0; x < arr.length; x++) { if(arr[x] % 1 == 0) { arr[x] = arr[x].toFixed(0); } else { arr[x] = arr[x].toFixed(3); } console.log(arr[x]) } 

What this does is checks the value to see if it is divisible by 1 and returns without any decimal places, otherwise, it lets it round to 3 decimal places.

Hope this helped!

Answer 3

You can use regex to check if the all the digits after \\. are zero or not.

If zero than replace with empty string else keep as it is.

 const data = ['400.000', '451.500', '1.520', '20.000', '300.210', '143.001'] const res = data.map(n=>{ return n.replace(/\\.0+$/, ""); }); console.log(res); 

Answer 4

 var number = 1.2345678; var result_number = round(number, 3); console.log(result_number); function round(value, decimals) { return Number(Math.round(value + 'e' + decimals) + 'e-' + decimals); } 

Try this, and it will solve your issue :)