This question already has answers here:
What is JavaScript's highest integer value that a number can go to without losing precision?
(21 answers)
What is the standard solution in JavaScript for handling big numbers (BigNum)?
(1 answer)
Closed 1 year ago.
I have a string as numbers. And I want to transform string to int.
So my code like that:
const bigNumber = '6972173290701864962'
console.log(bigNumber)
//6972173290701864962 =====> last digits : *****1864962
console.log(Number(bigNumber))
//6972173290701865000 =====> last digits : *****1865000
Why Im getting rounding number? How can I solve this problem?
The number is greater than Number.MAX_SAFE_INTEGER.
Instead, cast a to a BigInt:
const bigNumber = '6972173290701864962'
console.log('Number: '+Number(bigNumber))
console.log('BigInt: '+BigInt(bigNumber))
To remove the trailing n, simply call toString():
const bigNumber = '6972173290701864962'
console.log(BigInt(bigNumber).toString());
Related
This question already has answers here:
What is JavaScript's highest integer value that a number can go to without losing precision?
(21 answers)
Closed 4 days ago.
I was expecting 6145390195186705543 but gave me 6145390195186705000.
This is my code:
var str = '6145390195186705543';
var num = parseInt(str);
console.log(num)
JavaScript uses 64-bit floating point numbers, which can represent numbers in the range -(2^53 - 1) to (2^53 - 1). In this case, the number 6145390195186705543 is out of this range and cannot be accurately represented in JavaScript. When trying to convert the string "6145390195186705543" to a number using the parseInt() function, JavaScript cannot represent the number exactly and rounds it to the nearest floating point number, resulting in 6145390195186705000.
To work with such large numbers, you can use special libraries for working with large arithmetic, such as BigInt or BigNumber.
This question already has answers here:
How to format numbers? [duplicate]
(17 answers)
Closed 2 years ago.
I want to put a price on something and I get a string number and it should be divided by every 3 letters
but what eve I try to do I can't
is there any function or way that could be helpful ?
The simplest way is using Number#toLocaleString with a locale. The locale en-US uses commas to delimit every third digit and a dot to delimit the decimal fractional part.
const n = 1000000
const fractional = 12345.67
console.log(n.toLocaleString('en-US')) // 1,000,000
console.log(fractional.toLocaleString('en-US')) // 12,345.67
Use this function:
function numWithCommas(x) {
return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}
console.log(numWithCommas(100000));
This question already has answers here:
How to extract number from a string in javascript
(9 answers)
Get the first integers in a string with JavaScript
(5 answers)
How can I extract a number from a string in JavaScript?
(27 answers)
How to find a number in a string using JavaScript?
(9 answers)
Closed 2 years ago.
let string = "13th"
string = Number(string)
I expect it to return 13 instead I get NaN please how do I go about it
Try with parseInt()
If parseInt encounters a character that is not a numeral in the specified radix, it ignores it and all succeeding characters and returns the integer value parsed up to that point. parseInt truncates numbers to integer values. Leading and trailing spaces are allowed.
let string = "13th";
string = parseInt(string);
console.log(string);
This question already has answers here:
Javascript casts floating point numbers to integers without cause
(2 answers)
How to validate digits (including floats) in javascript
(10 answers)
Reference - What does this regex mean?
(1 answer)
Closed 4 years ago.
Any whole number ending in a dot returns the number in javascript console.(except decimal numbers)
like > 1. returns 1. Adding >1+1. also works. I don't understand why
typeof(1) // 'number'
typeof(1.) //'number'
However, when I put the same number inside a function, regex test gives a wrong output.
i.e,
const regex = /^\d+$/ //checks if there is a number inside a string
regex.test('1') // true
regex.test(1) //true
regex.test('1.') // false
The workaround I have is simply regex.test(Number('1.'))
JavaScript has a single type for all numbers: it treats all of them as floating-point numbers. However, the dot is not displayed if there are no digits after the decimal point:
5.000 = 5
Also, \d matches a digit, not a number.
This question already has answers here:
Truncate number to two decimal places without rounding
(43 answers)
Closed 5 years ago.
I'm trying to get the first decimals of a float number without any kind of rounding.
Example:
var myfloat = 1.1864526;
myfloat = myfloat.toFixed(2);
It returns 1.19 but I need 1.18.
I'm pretty sure there is an easy solution but I am unable to find it without converting the number to a string (not useful in this case).
Multiply the float value by 100, get the int value of the result then divide that int by 100. Something like this should work:
((int)(myFloat*100)) / 100