Base conversion is commonly used in JavaScript

Common base

The numbers that we encounter in our lives are based on the decimal system, which has to do with the fact that we have ten fingers on our hands, which is the way numbers are represented in human society, such as 0-9. However, in a computer, there are only two digits, 0 and 1, which are usually used to indicate the voltage level or the level of the electrical circuit, so all the digits and information in the computer are stored on the basis of binary, such as 0 and 1.

Usually, the numbers we are exposed to in computer programming are also in base 10, but when we encode data from network interfaces or file IO, the data we are exposed to is based on binary. For convenience, we usually convert binary data into hexadecimal for display, such as 0xABCDEF.

Therefore, this article introduces the common conversion between binary, octal, decimal, hexadecimal

Hexadecimal conversion

Hexadecimal conversion is mainly used in JavaScript Number. The parseInt () and Number. The prototype. The toString () method to implement, accept the parameters in the official document to convert hexadecimal Number

  • The number.parseint () method parses the string into integers based on the specified radix.

    Number.parseInt(string[, radix])
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  • Number. The prototype. The toString () method returns a string representation of the specified Number object.

    Number.prototype.toString([radix])
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binary

const binary = '0101010110';
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Binary to octal

const octal = Number.parseInt(binary, 2).toString(8);
console.log(octal)
/ / 526
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Binary to decimal

const decimal = Number.parseInt(binary, 2);
console.log(decimal);
/ / 342
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Binary to hexadecimal

const hexadecimal = Number.parseInt(binary, 2).toString(16);
console.log(hexadecimal);
/ / 156
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octal

const octal = '177';
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Octal to binary

const binary = Number.parseInt(octal, 8).toString(2);
console.log(binary);
/ / 1111111
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Convert octal to decimal

const decimal = Number.parseInt(octal, 8);
console.log(decimal)
/ / 127
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Octal to hexadecimal

const hexadecimal = Number.parseInt(octal, 8).toString(16);
console.log(hexadecimal);
// 7f
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The decimal system

const decimal = 255;
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Decimal to binary

const binary = Number.parseInt(decimal, 10).toString(2);
console.log(binary);
/ / 11111111
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Decimal to octal

const octal = Number.parseInt(decimal, 10).toString(8);
console.log(octal);
/ / 377
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Conversion from decimal to hexadecimal

const hexadecimal = Number.parseInt(decimal, 10).toString(16);
console.log(hexadecimal);
// ff
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hexadecimal

const hexadecimal = '0xfff';
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Conversion from hexadecimal to binary

const binary = Number.parseInt(hexadecimal, 16).toString(2);
console.log(binary);
/ / 111111111111
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Hexadecimal to octal

const octal = Number.parseInt(hexadecimal, 16).toString(8);
console.log(octal);
/ / 777
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Conversion from hexadecimal to decimal

const decimal = Number.parseInt(hexadecimal, 16);
console.log(decimal);
/ / 4095
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The other base

The other into the system, we can reference Number. The parseInt () and Number. The prototype, the toString () of redix to corresponding to convert hexadecimal Number

Source code has been posted to GitHub and can be downloaded and executed :-

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reference

Number

Number.parseInt()

Number.prototype.toString()