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How to Convert a Float Number to Whole Number in JavaScript

In this tutorial, you will read and learn detailed information about the methods used for converting a float number to a whole number with lots of examples.

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There are various easy methods to convert float number to the whole number in JavaScript. Let’s discuss each of them and see examples.

Here are several built-in functions used for rounding.

Math.floor()

The <kbd class="highlighted">math.floor</kbd> unction rounds the number passed as parameter to its nearest integer in downward direction:

Javascript Math.floor method

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Math.ceil()

The <kbd class="highlighted">Math.ceil()</kbd> function rounds a number up to the next largest whole number or integer:

Javascript Math.ceil method

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Math.round()

The <kbd class="highlighted">math.round()</kbd> function returns a number value which is rounded to the nearest integer:

Javascript Math.round()method

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Math.trunc()

The <kbd class="highlighted">math.trunc()</kbd> function removes any fractional digits and returns the integer part of a number:

Javascript Math.trunc method

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parseInt()

The <kbd class="highlighted">parseInt()</kbd> function parses the string argument and returns an integer of the given radix.

Javascript parsInt method

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The double bitwise not (~~) Operator

The <kbd class="highlighted">~~</kbd> operator rounds a number towards 0 if the operand is a number and it’s not NaN or Infinity.

Javascript double bitwise not (~~) Operator

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The bitwise OR (|) Operator

The <kbd class="highlighted">OR</kbd> operator rounds a number towards 0.

Javascript bitwise OR (|) Operator

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The shift (>>) Operator

The <kbd class="highlighted">shift</kbd> operator rounds a number towards 0:

Javascript shift operator

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The unsigned shift (>>>) Operator

The <kbd class="highlighted">unsigned shift</kbd> rounds a number towards 0:

Javascript unsigned shift operator

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The XOR (^) Operator

Javascript XOR (^) Operato

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Numbers

There are two types of numbers in JavaScript: Regular and BigInt. Regular is also known as “double-precision floating-point numbers”. The math is a built-in object which has properties and methods for mathematical constants and functions. The math object works with the Number type not BigInt.