Split Integer into 2 digits and put into array Javascript

Question

(Must read to understand exactly what I need) I would like to create a program that takes a number is input, such as: 12345 and then splits this number into 2 digit numbers and store it in a array. The array must look like this: [0]=45 [1]=23 [2]=1 . This means that the splitting of the numbers must start from the last digit of the number and not the first.

This is what I have until now:

var splitCount = []; // This is the array in which we store our split numbers
//Getting api results via jQuery's GET request
$.get("https://www.googleapis.com/youtube/v3/channels?part=statistics&id=UCJwchuXd_UWNxW-Z1Cg-liw&key=AIzaSyDUzfsMaYjn7dnGXy9ZEtQB_CuHyii4poc", function(result) {
    //result is our api answer and contains the recieved data
    //now we put the subscriber count into another variable (count); this is just for clarity
    count = result.items[0].statistics.subscriberCount;
    //While the subscriber count still has characters
    while (count.length) {
        splitCount.push(count.substr(0, 2)); //Push first two characters into the splitCount array from line 1
        count = count.substr(2); //Remove first two characters from the count string
    }       
    console.log(splitCount) //Output our splitCount array
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

but the problem with this is that if there are 5 digits for example: 12345 the the last digit will be in an array by itself like this: [0]=12 [1]=34 [2]=5 but I need the last array to have 2 digits and the first should be the one with one digit instead like this: [0]=1 [1]=23 [2]=45

Make it a string by concatenating it to a "", then back to an int with paresInt() method — Seraf
– Seraf, Commented Jan 17, 2017 at 20:37
You state that the output of 12345 should be like [0]=45 [1]=23 [2]=1 in the first part of your question, but like [0]=1 [1]=23 [2]=45, in the last part. Which is it? — Tomas Langkaas
– Tomas Langkaas, Commented Jan 18, 2017 at 11:48

Ori Drori · Accepted Answer · 2017-01-17 19:31:27Z

3

Split the string by using different regex for odd and even string lengths, Array#map it using Number, and Array#reverse the array:

function splitToNumbers(str) {
  return str.match(str.length  % 2 ? /^\d|\d{2}/g : /\d{2}/g).map(Number).reverse()
}
    
console.log(splitToNumbers('1234567'));

console.log(splitToNumbers('123456'));

edited Jan 17, 2017 at 19:31

answered Jan 17, 2017 at 18:54

Ori Drori

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Wais Kamal · Accepted Answer · 2017-01-17 19:36:56Z

1

Here is a snippet that fulfills the task. The function stores the values in the array myArray, and then outputs the array to a <p> element. The number is entered in the input box. Feel free to change this later.

function myFunction() {
  // Input field
  var input = document.getElementById('num');1
  // Length of the array storing the numbers
  var myArraySize = Math.floor(input.value.length / 2) + (input.value.length % 2);
  // The array storing the numbers
  var myArray = [];
  
  for (var i = 0; i < myArraySize; i++) {
    myArray[i] = input.value.slice(2*i,2*i+2);
  }
  // Output the array
  document.getElementById('demo').innerHTML = myArray;
}

<input id="num" type="text" onkeyup="myFunction()" />
<p id="demo">Result</p>

edited Jan 17, 2017 at 19:36

answered Jan 17, 2017 at 19:23

Wais Kamal

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Community · Accepted Answer · 2017-05-23 12:01:57Z

1

You could split the string with a regular expression and reverse the array.

This answer is heavily inspired by this answer.

var regex = /(?=(?:..)*$)/;

console.log('12345'.split(regex).reverse());
console.log('012345'.split(regex).reverse());

.as-console-wrapper { max-height: 100% !important; top: 0; }

edited May 23, 2017 at 12:01

CommunityBot

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answered Jan 17, 2017 at 20:10

Nina Scholz

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Redu · Accepted Answer · 2017-01-18 10:23:21Z

1

No need for regex or expensive calculations. You might simply do as follows;

var n = 250847534,
steps = ~~Math.log10(n)/2,
  res = [];
for(var i = 0; i <= steps; i++) {
  res.push(Math.round(((n /= 100)%1)*100));
  n = Math.trunc(n);
}
console.log(res);

edited Jan 18, 2017 at 10:23

answered Jan 18, 2017 at 9:21

Redu

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Tomas Langkaas · Accepted Answer · 2017-01-18 12:15:29Z

Amending your code a little

var splitCount = []; // This is the array in which we store our split numbers
//Getting api results via jQuery's GET request
$.get("https://www.googleapis.com/youtube/v3/channels?part=statistics&id=UCJwchuXd_UWNxW-Z1Cg-liw&key=AIzaSyDUzfsMaYjn7dnGXy9ZEtQB_CuHyii4poc", function(result) {
    //result is our api answer and contains the recieved data
    //now we put the subscriber count into another variable (count); this is just for clarity
    count = result.items[0].statistics.subscriberCount;
    //While the subscriber count still has characters
    while (count.length) {
        splitCount.push(count.substr(-2)); //Push last two characters into the splitCount array from line 1
        if(count.length > 1) {
           count =  count.substr(0, count.length - 2); //Remove first last two characters from the count string
        } else {
           break;
        }
    }       
    console.log(splitCount) //Output our splitCount array
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Community · Accepted Answer · 2017-05-23 11:45:47Z

There are several ways to approach your problem, from nice one-liners using regexes (like Ori Dori or Nina Scholz) to Redu's answer that works directly on numbers, avoiding strings.

Following the logic of your code example and comments, here is an alternative that converts the number to a string, loops over it backwards to extract two digits at a time, converts these back to a number (with the unary plus operator), and outputs this number to a result array:

function extract(num) {
  var s = '0' + num, //convert num to string
    res = [],
      i;
  for(i = s.length; i > 1; i -= 2) {
    //loop from back, extract 2 digits at a time, 
    //output as number,
    res.push(+s.slice(i - 2, i));
  }
  return res;
}

//check that 12345 outputs [45, 23, 1]
console.log(extract(12345));

//check that 123456 outputs [56, 34, 12]
console.log(extract(123456));

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