What is the best way to extract every nth digit from a number using a given reference point?

Question

What is the best way to extract every nth digit from a number using a given reference point?

The subject of the title may cause confusion, so let me clarify my goal.

With values of n = 51 and m = 24, I aim to achieve this result:

[
    {start:0, end:24}, 
    {start:24, end:48}, 
    {start:48, end:51}
]

Currently, I have made progress on this task, but I am encountering issues with adjusting the j and end parameters.

var n = 51;
var m = 24;
var arr = [];    

for (var j = 0; j < n; j += m) {
  var end = (j + j) >= n ? n : j;

  console.log(j, end);

  if (j > 0) arr.push({
    start: j,
    end: end
  });
}

Any suggestions or solutions would be greatly appreciated!

javascript arrays object

Answer 1

Answer №1

The issue lies within the calculation for your end value. If the sum of j and m is greater than n, then you should set end to be equal to n.

var n = 51;
var m = 24;
var arr = [];

for (var j = 0; j < n; j += m) {
  var end = (j + m);

  arr.push({
    start: j,
    end: end > n ? n : end
  });
}

output.innerHTML = JSON.stringify(arr, null, 2)

<pre id="output"></pre>

Answer 2

The issue lies within the calculation for your end value. If the sum of j and m is greater than n, then you should set end to be equal to n.

var n = 51;
var m = 24;
var arr = [];

for (var j = 0; j < n; j += m) {
  var end = (j + m);

  arr.push({
    start: j,
    end: end > n ? n : end
  });
}

output.innerHTML = JSON.stringify(arr, null, 2)

<pre id="output"></pre>

Answer 3

Answer №2

let num1 = 51;
let num2 = 21;
let array = [];

for (let k = 0; k < num1; k += num2) {

  let final = k + num2 > num1 ? num1 : k + num2;

  array.push({
    start: k,
    end: final
  });

}

alert(JSON.stringify(array));

Answer 4

let num1 = 51;
let num2 = 21;
let array = [];

for (let k = 0; k < num1; k += num2) {

  let final = k + num2 > num1 ? num1 : k + num2;

  array.push({
    start: k,
    end: final
  });

}

alert(JSON.stringify(array));

What is the best way to extract every nth digit from a number using a given reference point?

Answer №1

Answer №2

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