javascript remove decimals

JavaScript is a popular programming language that is widely used in web development. In some cases, we need to remove the decimal part of a number, which is also a common operation in JavaScript. This article will introduce how to remove the decimal part using JavaScript and provide some sample code.

1. How to remove decimals in JavaScript

In JavaScript, we can use Math.floor() and Math.trunc() to remove the decimal part.

1. Math.floor()

The Math.floor() method rounds a number down to the nearest integer. Its syntax structure is: Math.floor(x), where x is the number that needs to be rounded. For example, Math.floor(3.14159) will return 3 and Math.floor(-3.14159) will return -4. Note that this method does not simply remove the decimal part, but rounds down to the nearest integer.

2. Math.trunc()

Math.trunc() method can directly remove the decimal part of a number. Its syntax structure is: Math.trunc(x), where x is the number that needs to remove the decimal part. For example, Math.trunc(3.14159) will return 3 and Math.trunc(-3.14159) will return -3. It should be noted that this method only directly removes the decimal part and does not perform operations such as rounding or rounding up.

2. Sample code for JavaScript to remove decimals

Let’s look at some sample code for JavaScript to remove decimals.

1. Use Math.floor()

let x = 3.14159;
let y = Math.floor(x); // 返回3

let x = -3.14159;
let y = Math.floor(x); // 返回-4

2. Use Math.trunc()

let x = 3.14159;
let y = Math.trunc(x); // 返回3

let x = -3.14159;
let y = Math.trunc(x); // 返回-3

It should be noted that, remove The result after the decimal part will be an integer. If you need to keep the result to a certain number of decimal places, you can use methods such as toPrecision(), toFixed() or toLocaleString().

3. Summary

The methods to remove the decimal part in JavaScript include Math.floor() and Math.trunc(). The difference between the two is that Math.floor() will round down, while Math.trunc() directly removes the decimal part. By using these methods, we can easily remove the decimal part of a number and get an integer.

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