JavaScript Float to Int

In JavaScript, you can convert a float number to an integer by using various techniques. This is often required when working with mathematical calculations or when you want to remove the fractional part of a number.

Here are some methods to convert a float to an int in JavaScript:

1. Using the parseInt() function

You can use the parseInt() function to convert a float to an integer. This function parses a string argument and returns an integer. When passed a float number as a string, it will extract the integer part of the number:

let floatNum = 3.14;
let intNum = parseInt(floatNum);
console.log(intNum); // Output: 3

2. Using the Math.floor() function

The Math.floor() function returns the largest integer less than or equal to a given number. You can use this function to convert a float to an integer:

let floatNum = 3.14;
let intNum = Math.floor(floatNum);
console.log(intNum); // Output: 3

3. Using the bitwise OR operator

JavaScript bitwise OR | operator can be used to convert a float to an integer. This operator removes the decimal part of a number:

let floatNum = 3.14;
let intNum = floatNum | 0;
console.log(intNum); // Output: 3

4. Using the Math.trunc() function

The Math.trunc() function returns the integer part of a given number by removing any fractional digits. It can be used to convert a float to an integer:

let floatNum = 3.14;
let intNum = Math.trunc(floatNum);
console.log(intNum); // Output: 3

Note: The Math.trunc() function is not supported in Internet Explorer.

These are some common methods to convert a float to an integer in JavaScript. Choose the method that best suits your requirements and compatibility with different browsers.

Remember to always consider the possible rounding errors and the limitations imposed by the data type when converting float to int.