JavaScript only has a Number type that stores floating point values.
There is no int.
Edit:
If you want to format the number as a string with two digits after the decimal point use:
(4).toFixed(2)
Top answer 1 of 3
157
JavaScript only has a Number type that stores floating point values.
There is no int.
Edit:
If you want to format the number as a string with two digits after the decimal point use:
(4).toFixed(2)
2 of 3
15
toFixed() method formats a number using fixed-point notation. Read MDN Web Docs for full reference.
var fval = 4;
console.log(fval.toFixed(2)); // prints 4.00
GeeksforGeeks
geeksforgeeks.org › dsa › convert-int-to-float
Convert int to float - GeeksforGeeks
March 26, 2024 - In Explicit Type Conversion,we manually convert one data type to another using built-in functions such as int(), float(), str(), etc.
Does JavaScript supports conversion of integer X to X.0 as typeof number?
This doesn't really make sense in context of JavaScript. As far as JS is concerned, the numbers 5 and 5.0 are exactly the same. In context of JSON, the numbers are also exactly the same. Hence, you can't really "make 5 into 5.0" because it already is, and the fact the decimals are not displayed is just how the number happens to be formatted by the particular JS engine that's displaying it to you. If you have a bizarre API which refuses to accept numbers such as 5, but won't accept a string '5.0', you will probably have to format the values yourself. Eg. use whatever.toFixed(1), which gives you a string, and then manually strip out the string delimiters from the JSON data. You might be able to do this using the optional replacer function for JSON.stringify - just have it check if the value is typeof 'number', and ensure it always uses toFixed when formatting them. More on reddit.com
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January 1, 2023[SOLVED] typecast float to int in javascript? - Unity Engine - Unity Discussions
A forum search has lead me to think it’s not doable. “as” only works on reference types and Unity doesn’t dig var f1 : float = 3.14; var myVar : int = (int)f1; or var f1 : float = 3.14; var myVar : int = int(f1); If anyone knows a typecast method that work’s I’d appreciate a “how ... More on discussions.unity.com
1
September 18, 2009[AskJS] Its about time javascript should get a "integer" and "float" data type.
JavaScript numbers are double-precision floating-point values, also known as a double in other languages like C. This covers the "float" side of things. Now, a double-precision floating-point value can perfectly represent integers up to 52 bits, which is a lot bigger than the 32 bits an int can typically store in other languages. JavaScript bitwise operators such as & or | or ^ also convert their values to 32-bit integers before doing their work. So, just use regular JavaScript numbers to perform your integer arithmetic, and then throw in a few | 0 operations if you want the rounding / clamping behavior found in other language's 32-bit int types. In other words, everything you want is already present. More on reddit.com
46
0
August 10, 2022Convert a Float number to an Int type
I am trying to convert a float number to an integer. The reason is that I want the E8S equivalent of 1 ICP of a value, for example 1.15. This should be 115_000_000, but the function returns 114_000_000. Other values are calculated correctly, for example 1.25 = 125_000_000 or 0.9 = 90_000_000. ... More on forum.dfinity.org
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0
June 10, 2024Videos
03:06
How to convert a STRING to FLOAT/INT in JavaScript. - YouTube
03:57
#27 Number Methods in JS | toString , toFixed, toPrecision, parseInt, ...
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Who Broke JavaScript Floating Point Numbers? [Intermediate Tutorial] ...
01:30
Understanding JavaScript Conversion: From Integer to Float - YouTube
08:23
How to Format Numbers with toFixed() and parseFloat() in ...
01:56
Parsing Integer & Float in Javascript - 24 - YouTube
Top answer 1 of 16
2261
var intvalue = Math.floor( floatvalue );
var intvalue = Math.ceil( floatvalue );
var intvalue = Math.round( floatvalue );
// `Math.trunc` was added in ECMAScript 6
var intvalue = Math.trunc( floatvalue );
Math object reference
Examples
Positive// value=x // x=5 5<x<5.5 5.5<=x<6
Math.floor(value) // 5 5 5
Math.ceil(value) // 5 6 6
Math.round(value) // 5 5 6
Math.trunc(value) // 5 5 5
parseInt(value) // 5 5 5
~~value // 5 5 5
value | 0 // 5 5 5
value >> 0 // 5 5 5
value >>> 0 // 5 5 5
value - value % 1 // 5 5 5
// value=x // x=-5 -5>x>=-5.5 -5.5>x>-6
Math.floor(value) // -5 -6 -6
Math.ceil(value) // -5 -5 -5
Math.round(value) // -5 -5 -6
Math.trunc(value) // -5 -5 -5
parseInt(value) // -5 -5 -5
value | 0 // -5 -5 -5
~~value // -5 -5 -5
value >> 0 // -5 -5 -5
value >>> 0 // 4294967291 4294967291 4294967291
value - value % 1 // -5 -5 -5
// x = Number.MAX_SAFE_INTEGER/10 // =900719925474099.1
// value=x x=900719925474099 x=900719925474099.4 x=900719925474099.5
Math.floor(value) // 900719925474099 900719925474099 900719925474099
Math.ceil(value) // 900719925474099 900719925474100 900719925474100
Math.round(value) // 900719925474099 900719925474099 900719925474100
Math.trunc(value) // 900719925474099 900719925474099 900719925474099
parseInt(value) // 900719925474099 900719925474099 900719925474099
value | 0 // 858993459 858993459 858993459
~~value // 858993459 858993459 858993459
value >> 0 // 858993459 858993459 858993459
value >>> 0 // 858993459 858993459 858993459
value - value % 1 // 900719925474099 900719925474099 900719925474099
// x = Number.MAX_SAFE_INTEGER/10 * -1 // -900719925474099.1
// value = x // x=-900719925474099 x=-900719925474099.5 x=-900719925474099.6
Math.floor(value) // -900719925474099 -900719925474100 -900719925474100
Math.ceil(value) // -900719925474099 -900719925474099 -900719925474099
Math.round(value) // -900719925474099 -900719925474099 -900719925474100
Math.trunc(value) // -900719925474099 -900719925474099 -900719925474099
parseInt(value) // -900719925474099 -900719925474099 -900719925474099
value | 0 // -858993459 -858993459 -858993459
~~value // -858993459 -858993459 -858993459
value >> 0 // -858993459 -858993459 -858993459
value >>> 0 // 3435973837 3435973837 3435973837
value - value % 1 // -900719925474099 -900719925474099 -900719925474099
2 of 16
348
Bitwise OR operator
A bitwise or operator can be used to truncate floating point figures and it works for positives as well as negatives:
function float2int (value) {
return value | 0;
}
Results
float2int(3.1) == 3
float2int(-3.1) == -3
float2int(3.9) == 3
float2int(-3.9) == -3
Performance comparison?
I've created a JSPerf test that compares performance between:
Math.floor(val)val | 0bitwise OR~~valbitwise NOTparseInt(val)
that only works with positive numbers. In this case you're safe to use bitwise operations well as Math.floor function.
But if you need your code to work with positives as well as negatives, then a bitwise operation is the fastest (OR being the preferred one). This other JSPerf test compares the same where it's pretty obvious that because of the additional sign checking Math is now the slowest of the four.
Note
As stated in comments, BITWISE operators operate on signed 32bit integers, therefore large numbers will be converted, example:
1234567890 | 0 => 1234567890
12345678901 | 0 => -539222987
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › Number › parseFloat
Number.parseFloat() - JavaScript | MDN
The Number.parseFloat() static method parses an argument and returns a floating point number. If a number cannot be parsed from the argument, it returns NaN. function circumference(r) { if (Number.isNaN(Number.parseFloat(r))) { return 0; } return parseFloat(r) * 2.0 * Math.PI; } console.lo...
GeeksforGeeks
geeksforgeeks.org › javascript › how-to-convert-a-float-number-to-the-whole-number-in-javascript
How to Convert a Float Number to the Whole Number in JavaScript? - GeeksforGeeks
July 11, 2025 - ... // float value is 4.59; let x = 4.59; let z = Math.round(x); console.log("Converted value of " + x + " is " + z); ... Return the integer part of a floating-point number by removing the fractional digits.
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › Number
Number - JavaScript | MDN
A number literal like 37 in JavaScript code is a floating-point value, not an integer. There is no separate integer type in common everyday use. (JavaScript also has a BigInt type, but it's not designed to replace Number for everyday uses.
Reddit
reddit.com › r/learnjavascript › does javascript supports conversion of integer x to x.0 as typeof number?
r/learnjavascript on Reddit: Does JavaScript supports conversion of integer X to X.0 as typeof number?
January 1, 2023 -
Given string lets say “5” I want to convert it to 5.0 (typeof Number)
Already tried combinations/permutations of all the following: parseFloat() toFixed() toPrecision() Number() Also tried with “+” (implicit Number casting)
I always end up with either typeof string Or just the number 5
Its for an API that expects “float” but does not accept integers (5 is invalid, 5.0 is valid)
Any ideas would be appreciated.
Top answer 1 of 9
28
This doesn't really make sense in context of JavaScript. As far as JS is concerned, the numbers 5 and 5.0 are exactly the same. In context of JSON, the numbers are also exactly the same. Hence, you can't really "make 5 into 5.0" because it already is, and the fact the decimals are not displayed is just how the number happens to be formatted by the particular JS engine that's displaying it to you. If you have a bizarre API which refuses to accept numbers such as 5, but won't accept a string '5.0', you will probably have to format the values yourself. Eg. use whatever.toFixed(1), which gives you a string, and then manually strip out the string delimiters from the JSON data. You might be able to do this using the optional replacer function for JSON.stringify - just have it check if the value is typeof 'number', and ensure it always uses toFixed when formatting them.
2 of 9
5
The only integer type in JS is the new long-integer type, and the code you are dealing with probably doesn't expect nor accept the new type. In colloquial usage, Javascript numbers are floats even if they are thought of as integers or have integer values. If you say 5, for example, in your source code, this is a floating-point number.
Unity
discussions.unity.com › unity engine
[SOLVED] typecast float to int in javascript? - Unity Engine - Unity Discussions
September 18, 2009 - A forum search has lead me to think it’s not doable. “as” only works on reference types and Unity doesn’t dig var f1 : float = 3.14; var myVar : int = (int)f1; or var f1 : float = 3.14; var myVar : int = int(f1);…
GeeksforGeeks
geeksforgeeks.org › javascript › javascript-program-to-check-if-a-number-is-float-or-integer
JavaScript Program to Check if a Number is Float or Integer - GeeksforGeeks
July 23, 2025 - A float is a number with a decimal point, while an integer is a whole number or a natural number without having a decimal point. ... We will explore every approach to Check if a Number is a Float or Integer, along with understanding their basic implementations.
W3Schools
w3schools.com › js › js_numbers.asp
W3Schools.com
Numbers can be written with or without decimals. let x = 3.14; // A number with decimals let y = 3; // A number without decimals ... Unlike many other programming languages, JavaScript does not define different types of numbers, like integers, ...
Reddit
reddit.com › r/javascript › [askjs] its about time javascript should get a "integer" and "float" data type.
r/javascript on Reddit: [AskJS] Its about time javascript should get a "integer" and "float" data type.
August 10, 2022 -
After all the improvements/features and fixes which were made to javascript (or precisely ECMAScript) since ES6 (ES2015) till now (ES2022), isn't it about time to fix the ultimate pending weakness i.e. having an Integer and a Float type as well (just like "var" keyword was/is there but they added "let" and "const" as a better semantics and good practice) and not just mashup everything in Number.
Heck, we even got a big int to represent big integers (no floats allowed) but we still don't have Integer's and Floats which are SUPER useful in almost every scenario.
So, why is it still not added and not planned as well? Those are VERY important data types and MOST languages HAVE those data types as they are NEEDED, why is it not planned for ECMAScript? Is it planned? Do you want to see this added?
Top answer 1 of 5
30
JavaScript numbers are double-precision floating-point values, also known as a double in other languages like C. This covers the "float" side of things. Now, a double-precision floating-point value can perfectly represent integers up to 52 bits, which is a lot bigger than the 32 bits an int can typically store in other languages. JavaScript bitwise operators such as & or | or ^ also convert their values to 32-bit integers before doing their work. So, just use regular JavaScript numbers to perform your integer arithmetic, and then throw in a few | 0 operations if you want the rounding / clamping behavior found in other language's 32-bit int types. In other words, everything you want is already present.
2 of 5
9
Are you actually running into problems with number? Or do you just want it because has it?
TutorialsTeacher
tutorialsteacher.com › javascript › javascript-number
JavaScript Numers: Integer, Float, Binary, Exponential, Hexadecimal, Octal
Append n to the end of an integer to make it BigInt. ... //16 digit integer var int1 = 1234567890123459n; //will be 1234567890123459 //17 digit integer var int2 = 12345678901234569n; //will be 12345678901234569 //20 digit integer var int3 = ...
Internet Computer Developer Forum
forum.dfinity.org › developers
Convert a Float number to an Int type - Developers - Internet Computer Developer Forum
June 10, 2024 - I am trying to convert a float number to an integer. The reason is that I want the E8S equivalent of 1 ICP of a value, for example 1.15. This should be 115_000_000, but the function returns 114_000_000. Other values are calculated correctly, for example 1.25 = 125_000_000 or 0.9 = 90_000_000. public func convertFloatToNat(x: Float): async Int { let ONE_ICP_IN_E8S = 100_000_000; Debug.print("convertFloatToNat "#debug_show(x)); let a = x * 100; Debug.print("float x 100 = "#...
TutorialsPoint
tutorialspoint.com › article › How-do-I-convert-a-float-number-to-a-whole-number-in-JavaScript
How do I convert a float number to a whole number in JavaScript?
July 20, 2022 - We have discussed the four approaches to converting the float number to a whole number. The second approach is the easiest one as it parses the integer only from the float number.
Zod
zod.dev › api
Defining schemas | Zod
To fix this, always pass the array directly into the z.enum() function, or use as const.
Codemia
codemia.io › knowledge-hub › path › how_do_i_convert_a_float_number_to_a_whole_number_in_javascript
How do I convert a float number to a whole ...
Enhance your system design skills with over 120 practice problems, detailed solutions, and hands-on exercises
Itsourcecode
itsourcecode.com › home › converting floats to integers in javascript: 10 effective ways
Converting Floats to Integers in JavaScript: 10 Effective Ways
July 27, 2023 - This function parses a string argument and returns an integer. ... To convert a float, we can pass the floating-point number as a string to the parseInt() function.
Tutorial Republic
tutorialrepublic.com › faq › how-to-convert-a-float-number-to-a-whole-number-in-javascript.php
How to Convert a Float Number to a Whole Number in JavaScript
You can use the trunc() method to get the integer part of a number by removing any fractional digits. This method was added in ECMAScript 6 and supported by the latest browsers such as Chrome, Firefox, Safari, Opera, and Edge browsers.
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › parseFloat
parseFloat() - JavaScript | MDN
The parseFloat() function parses a string argument and returns a floating point number. function circumference(r) { return parseFloat(r) * 2.0 * Math.PI; } console.log(circumference(4.567)); // Expected output: 28.695307297889173 console.log(circumference("4.567abcdefgh")); // Expected output: ...
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › Math › random
Math.random() - JavaScript | MDN
The Math.random() static method returns a floating-point, pseudo-random number that's greater than or equal to 0 and less than 1, with approximately uniform distribution over that range — which you can then scale to your desired range. The implementation selects the initial seed to the random ...