Pushing out random number in array format in javascript

Question

Given a non-negative integer, return an array or a list of the individual digits in order.

digitize(n): separate multiple digit numbers into an array.

Parameters:

n: number - Number to be converted

Return value:

Array<number> - Array of separated single digit integers

Example:

n            123
Return value [1,2,3]

Here is what I have done

Function digitize(n) {
  let number =[ ];
  let stringDigi = n.tostring();

  for (let i = 0, len = stringDigi.length; i < len; i++) {
    number.push (+stringDigi.charAt(i)); 
  }

  return number;
}

n.tostring(); won't work, capitalization matters in programming — CertainPerformance
– CertainPerformance, Commented Mar 19, 2019 at 23:41

tam.dangc · Accepted Answer · 2019-03-19 23:52:48Z

1

Just make it simple

const fn = n => n.toString().split('').map(e => parseInt(e))

console.log(fn(123))

And take care of the syntax.

function not Function

toString() not tostring()

answered Mar 19, 2019 at 23:52

tam.dangc

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Comments

jo_va · Accepted Answer · 2019-03-20 07:58:20Z

0

For non-negative integers (0, 1, ...), you can use toString() or a template string followed by split() and map(), use the + operator to turn your digit into a number:

const digitize = n => `${n}`.split('').map(x => +x);

console.log(...digitize(0));
console.log(...digitize(1234));

Another way is to use match(/\d/g) to extract the digits with a regex. This method works with all numbers without modification, except for || [] that handles non-matches when undefined/null is passed in:

const digitize = n => (`${n}`.match(/\d/g) || []).map(x => +x)

console.log(...digitize(0));
console.log(...digitize(1234));
console.log(...digitize(-12.34));
console.log(...digitize(undefined));

To make the first method work for all numbers, null and undefined, you have to add a ternary and a filter() on isNaN() values:

const digitize =
  n => n || n === 0 ? `${n}`.split('').map(x => +x).filter(x => !isNaN(x)) : [];

console.log(...digitize(0));
console.log(...digitize(1234));
console.log(...digitize(-12.34));
console.log(...digitize(undefined));

If you want to use a for loop, I suggest to use for/of. Also take care of the case when writing function and toString:

function digitize(n) {
  const number = [];
  const str = n.toString();
  for (const c of str) {
   number.push(+c); 
  }
  return number;
}

console.log(...digitize(1234));

edited Mar 20, 2019 at 7:58

answered Mar 19, 2019 at 23:45

jo_va

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1 Comment

tam.dangc Over a year ago

The input is "non-negative integer"

Promise Tochi · Accepted Answer · 2019-03-19 23:47:04Z

0

You can do

function digitize(n) {
  return (n).toString().split("");
}

answered Mar 19, 2019 at 23:47

Promise Tochi

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