How to convert a float number to the whole number in JavaScript ?

In this article, we will convert a float number to a whole number in Javascript. There are various methods to convert float numbers to whole numbers in JavaScript.

• Math.floor() method
• Math.ceil() method
• Math.round() method
• Math.trunc() method
• parseInt() method
• double bitwise not (~~) method
• bitwise OR (|) operator
• Using shift (>>) operator
• unsigned shift (>>>) operator
• By subtracting the fractional part
• XOR (^) operator

We will see these methods one by one now.

Math.floor (floating argument): Round off the number passed as a parameter to its nearest integer in the Downward direction. 

Syntax:

Math.floor(value)

Example: In this example, we are using the above-explained method.

javascript

//float value is 4.59;
let x = 4.59;
let z = Math.floor(x);
console.log("Converted value of " + x + " is " + z);

Output:

Converted value of 4.59 is 4

Math.ceil (floating argument): Return the smallest integer greater than or equal to a given number. 

Syntax:

Math.ceil(value)

Example: Here is the basic use of the Math.ceil() method.

javascript

//float value is 4.59;
let x = 4.59;
let z = Math.ceil(x);
console.log("Converted value of " + x + " is " + z);

Output:

Converted value of 4.59 is 5

Math.round (floating argument): Round a number to its nearest integer. 

Syntax:

Math.round(var);

Example: Here we are using the above-explained method to convert numbers.

javascript

//float value is 4.59;
let x = 4.59;
let z = Math.round(x);
console.log("Converted value of " + x + " is " + z);

Output:

Converted value of 4.59 is 5

Math.trunc (floating argument): Return the integer part of a floating-point number by removing the fractional digits. 

Syntax:

Math.trunc(value)

Example: Here we are using Math.trunc() method to remove the fractional digits.

javascript

//float value is 4.59;
let x = 4.59;
let z = Math.trunc(x);
console.log("Converted value of " + x + " is " + z);

Output:

Converted value of 4.59 is 4

parseInt (floating argument): Accept the string and convert it into an integer. 

Syntax:

parseInt(Value, radix)

Example: Here is basic example of above method.

javascript

//float value is 3.54;
let x = 3.54;
let z = parseInt(x);
console.log("Converted value of " + x + " is " + z);

Output:

Converted value of 3.54 is 3

double bitwise not (~~) operator: Round a number to zero. If an operand is a number and it’s not NaN or Infinity. 

Syntax:

~~value

Example: Here is the example of a not(~~) operator.

javascript

//float value is 4.59;
let x = 4.59;
let z = ~~x;
console.log("Converted value of " + x + " is " + z);

Output:

Converted value of 4.59 is 4

JavaScript bitwise OR (|) Operator: Round a number towards zero. 

Syntax:

let = value | 0;

Example: Here is an example of the above-explained method.

javascript

//float value is 5.67;
let x = 5.67;
let z = x | 0;
console.log("Converted value of " + x + " is " + z);

Output:

Converted value of 5.67 is 5

Using shift (>>) operator: Round a number to towards zero. 

Syntax:

let = value >> 0;

Example: Basic example of shift(>>) operator.

javascript

//float value is 5.63;
let x = 5.63;
let z = x >> 0;
//it is same as we are dividing the value by 1.
console.log("Converted value of " + x + " is " + z);

Output:

Converted value of 5.63 is 5

Using unsigned shift (>>>) operator Round a number to towards zero. 

Syntax:

let = value >>> 0;

Example: Here is an example of the above-explained method.

javascript

//float value is 5.68;
let x = 5.68;
//it is same as we are dividing the value by 1.
let z = x >>> 0;
console.log("Converted value of " + x + " is " + z);

Output:

Converted value of 5.68 is 5

By subtracting the fractional part Syntax:

let = val - val%1;

Example: In this example, we are using the above-explained method.

javascript

//float value is 5.48;
let x = 5.48;
let z = x - x % 1;
console.log("Converted value of " + x + " is " + z);

Output:

Converted value of 5.48 is 5

Using XOR (^) operator Syntax:

let = value ^ 0;

Example: Here is the basic use of the XOR(^) operator.

javascript

//float value is 5.49;
let x = 5.49;
let z = x ^ 0;
console.log("Converted value of " + x + " is " + z);

Output:

Converted value of 5.49 is 5