How to implement binary bits in JavaScript

JavaScript is an object-oriented programming language that supports binary operations and can use bit operators to implement binary bits. This article will introduce how to implement binary bits in JavaScript.

1. Binary representation

Binary is a mathematical counting system that only contains 0 and 1, representing numbers from zero to infinity. In the field of computer science, binary is most commonly used to represent data in computers. For example, each byte in computer memory is an 8-bit binary number.

The binary representation method is very simple. You only need to use 0 and 1 to represent each bit in order from right to left. For example, the binary number 1101 represents the decimal number 13, in which the rightmost digit is bit 0, the first bit is 1, the second bit is 0, and the third bit is 1.

2. Bitwise operations in JavaScript

In JavaScript, you can use bitwise operators to operate on binary numbers. The following lists some bitwise operators and how to use them:

1. Binary left shift operator (<<): Shifts the binary digits of a number to the left by the specified number of digits.

For example, the following code can move the binary digit of the number 5 to the left by 2 bits: 5 << 2, and the result is 20.

2. Binary right shift operator (>>): Shifts the binary digits of a number to the right by the specified number of digits.

For example, the following code can move the binary digit of the number 10 to the right by 2 bits: 10 >> 2, and the result is 2.

3. Zero-extended right shift operator (>>>): Shifts the binary digits of a number to the right by the specified number of digits and fills it with 0s on the left.

For example, the following code can move the binary digit of the number -2 to the right by 2 bits: -2 >>> 2, and the result is 1073741822.

4. Bitwise AND operator (&): performs a logical AND operation on the corresponding bits of two binary numbers.

For example, the following code can perform a bitwise AND operation on the number 10 and the number 5: 10 & 5, and the result is 0.

5. Bitwise OR operator (|): Perform logical OR operation on the corresponding bits of two binary numbers.

For example, the following code can perform a bitwise OR operation on the number 10 and the number 5: 10 | 5, and the result is 15.

6. Bitwise XOR operator (^): Performs a logical XOR operation on the corresponding bits of two binary numbers.

For example, the following code can perform a bitwise XOR operation on the number 10 and the number 5: 10 ^ 5, and the result is 15.

3. JavaScript implements binary bit operations

Using bit operators can implement binary bit operations in JavaScript. Here are some implementation methods:

1. Obtain the value at the specified bit

You can use the bitwise AND operator (&) and the right shift operator (>>) to achieve Get the value at the specified position.

For example, the following code can get the value from the 1st to the 3rd digit of the number 10: (10 & (1 << 3 - 1)) >> 1, the result is 1.

2. Set the value in the specified bit to a specific value

You can use the bitwise OR operator (|) and the left shift operator (<<) to achieve the specified bit Set the value on to a specific value.

For example, the following code can set the value from the 1st to the 3rd digit of the number 10 to the specific value 5: (10 & ~(1 << 3 - 1)) | (5 < ;< 1), the result is 26.

3. Determine whether the value at the specified bit is 1

You can use the bitwise AND operator (&) and the left shift operator (<<) to determine whether the value at the specified bit is 1. Whether the value is 1.

For example, the following code can determine whether the first digit of the number 10 is 1: (10 & (1 << 1)) != 0. If it is true, it means that the value in the first digit is 1.

4. Summary

This article introduces the operation method of binary bits in JavaScript. Bit operators can be used to obtain, set, and determine the value of a specified bit, which is very useful in some scenarios that require bit operations.

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