How to convert string to binary on 7 bits? (JavaScript)

Question

I need to convert a string to binary specifically on 7 bits.

'%'.charCodeAt().toString(2)

The above code return 100101, I think it convert on 8 bits. (so this link How to convert text to binary code in JavaScript? is not helping me).

% is equal to 0100101 in binary on 7 bits.

The only links I found on SO are about Java.

What if you calculate the length of the binary and if it less than 7 bin then add zero(s) at the left of the binary number? — Sajeeb Ahamed
– Sajeeb Ahamed, Commented Jul 6, 2020 at 17:09

JardonS · Accepted Answer · 2021-12-05 20:13:52Z

5

You can use the method String.prototype.padStart()

const sevenBitBinary = (char) => char.charCodeAt().toString(2).padStart(7, '0');

console.log(sevenBitBinary('%'));

edited Dec 5, 2021 at 20:13

JardonS

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answered Jul 6, 2020 at 17:14

Sajeeb Ahamed

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1 Comment

Ehsan Nazeri Over a year ago

if char have ascii bigger than 128 ,it will show 8 bits

Jonas Wilms · Accepted Answer · 2020-07-06 17:10:20Z

1

You can add 0s add the beginning with .padStart.

answered Jul 6, 2020 at 17:10

Jonas Wilms

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Comments

Ehsan Nazeri · Accepted Answer · 2020-07-06 17:20:13Z

0

I think it can help you

function get7BitsBinaryString(number) {
  var result = '';
  var bits = [64, 32, 16, 8, 4, 2, 1];
  bits.forEach(bit => {
    if ((bit & number) === bit) {
      result += '1';
    } else {
      result += '0';
    }
  });
  return result;
}

console.log(get7BitsBinaryString('%'.charCodeAt()));

answered Jul 6, 2020 at 17:20

Ehsan Nazeri

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