Numbers Enhanced

JavaScript implements all numbers in the double-precision 64-bit binary format IEEE 754. This basically means that JS incorporates all the numbers between -(253) -1 to 253 - 1. There is no specific type for numbers. JavaScript is both able to represent floating-point numbers, as well as the symbolic value of Infinity, -Infinity, and NaN (Not a Number). Basically, JS has in its library a vast supply of integers that are at the disposal of the developer.

You can use numberic literals for the following: decimal, binary, octal, and hexadecimal.

Decimal Numbers

Note: decimal literals can start with 0, followed by another decimal digit; however, if EVERY number following the 0 is LESS THAN 8, the number is parsed as an octal number.

1234567890
1150

// Use caution when starting a number with a 0

// Parsed as a decimal

0888 // 888

// Parsed as an octal

0777 // 511 - parsed as octal in non-strict mode

Binary Numbers

Binary number syntax incorporates a leading 0, followed by the letter 'B' (upper or lower case - b or B). The appropriate numbers following should be either 0 or 1. If the following numbers are not zero or one, a SyntaxError is thrown.

var a = 0b10000000000000000000000000000000; // 2147483648
var b = 0b01111111100000000000000000000000; // 2139095040
var c = 0B00000000011111111111111111111111; // 8388607

Octal Numbers

Octal number syntax begins with a 0, and is followed by digits ranging between 0 and 7.

var n = 0755; // 493
var m = 0644; // 420

Strict mode in ES2015 (or higher) forbids octal syntax; rather, if desired, the developer must prefix an octal number with a zero, followed by the letter 'O' (0o).

// for ES2015

var a = 0o10; // 8

Hexadecimal Numbers

Hexadecimal numbers incorporate alpha-numberic digits to convey specific numeric values. The syntax uses a 0, followed by the letter 'X' (upper or lower case - x or X). The range of the digits must be the following: 0123456789ABCDEF; if it is outside this range, a SyntaxError is thrown.

0xFFFFFFFFFFFFFFFFF // 295147905179352830000
0x123456789ABCDEF   // 81985529216486900
0XA                 // 10

Exponentiation

1E3   // 1000
2e6   // 2000000
0.1e2 // 10