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Binary and Octal Literals
Recently, binary, octal, and hexadecimal literals have been supported in JavaScript. Such literals begin with 0 and are internally integers.
console.log(0b001 === 1); // binary
console.log(0o10 + 1); // octal
console.log(010); // octal
console.log(0xff); // hex
console.log((0xff).toString(16)); // hextrue
9
8
255
ff