You can convert a decimal number to binary, octal, or hexadecimal in JavaScript using the toString() method. Here are some examples:

Binary:

let decimal = 15;
let binary = decimal.toString(2);
console.log(binary); // Output: "1111"

Octal:

let decimal = 15;
let octal = decimal.toString(8);
console.log(octal); // Output: "17"

Hexadecimal:

let decimal = 15;
let hex = decimal.toString(16);
console.log(hex); // Output: "f"

You can also use the Number#toString method to convert decimal to other bases, like so:

let decimal = 15;
console.log(decimal.toString(2));  // binary
console.log(decimal.toString(8));  // octal
console.log(decimal.toString(16)); // hexadecimal

You can also use the built-in functions parseInt() ,

let decimal = 15;
let binary = parseInt(decimal, 10).toString(2);
let octal = parseInt(decimal, 10).toString(8);
let hex = parseInt(decimal, 10).toString(16);
console.log(binary); // Output: "1111"
console.log(octal); // Output: "17"
console.log(hex); // Output: "f"

Note that the first parameter passed to the toString() method is the base you want to convert to, and the second parameter is the decimal number you want to convert.

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