如何将十进制转换为十六进制，以便结果是数字而不是字符串？

Question

I am manually sending numbers to an arduino board as hexadecimal like this: sendToBoard(0xE) I am now trying to get decimal numbers converted into hexadecimal, but I can only get strings

const number = 14
number.toString(16) //e  --> string

Could I possibly get this 'e' as hexadecimal to send it to the board like sendToBoard(number) //number === e (in hex)

Answer 1

In Javascript numbers are implemented using double-precision 64-bit binary format . So even if you present them in hexadecimal format, under the hood they will be saved using floating-point representation.

if you have a number and you want the sendToBoard function to receive a number as its input, then just pass in the number:

function sendToBoard(number){
    // you can later convert it to a string:
    const str = '0x' + number.toString(16).toUpperCase();
}

Alternatively, if you have a string in a hexadecimal representation, and you want sendToBoard to receive a number type, you could do the following:

const number = parseInt('0xf', 16);
sendToBoard(number);

Hope this helps:)