Question 249173 in Javascript Question posted in
A very good W3school tutorial can be found here.

Javascript – make a counter (like a binary count) JS

you need to make a counter like this:

0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 1

how to implement this beautifully?

I haven’t figured out how to implement this.

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2

Answers


  1. 0
    • Loop your counter with while(true) incrementing it.
    • Use Number.toString(2) to format the counter to the binary form where 2 is a number of bits per a character.
    • Use String.padStart(3, '0') to make strings 3 character long.
    • If the length > 3 break the cycle
    • Split the string and join with " " to add spaces between numbers.
    let count = 0;
let result = '';

while(true){
  const text = (count++).toString(2).padStart(3, '0');
  if(text.length > 3) break;
  result += text.split('').join(' ') + 'n';
}

$pre.textContent = result;
    <pre id="$pre"></pre>
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  2. 0

    Binary addition is simple:

    • find the rightmost zero bit
    • set it to 1
    • set all bits right to it to 0
    a = Array(3).fill(0)

while (1) {
    console.log(...a)
    let z = a.lastIndexOf(0)
    if (z < 0)
        break
    a[z] = 1
    a.fill(0, z + 1)
}

    Homework: rewrite without builtins, using only fors and ifs.

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