Javascript get digits from number

Javascript javascript convert number to array of digits

We will convert the number into a string, then split it to get an array of strings of digit, then we will convert the string into numbers, reverse the array and finally return it. For getting a reverse array of digit, you need to return the reversed array.

Convert number to reversed array of digits?

You need a join to the reversed array and return the parsed string.

function digitize(n) < var num = n.toString(); var arr = num.split(""); return parseInt(arr.join(''), 10); // ^^^ ^^^^^^^^^ >console.log(digitize(2348));

For getting a reverse array of digit, you need to return the reversed array.

function digitize(n) < var num = n.toString(); var arr = num.split(""); return arr.reverse(); >console.log(digitize(2348));

You need to convert your digits from strings to integers. This can be done with parseInt or with a unary plus + .

function digitize(n) < var arr = n.toString().split("").map(function (digit) < return +digit; >); return arr; >console.log(digitize(12345));

Javascript — array of 9 digit numbers convert to jpg, array of 9 digit numbers convert to jpg. Ask Question Asked today. Modified today. Viewed 6 times 0 I want to make a nodejs application that takes a 9 digit numbers array which represent an rgb pixel so 123456789 represent r:123, g:456, b:789 and convert it to jpg image. Browse other questions tagged …

Change base of a number in JavaScript using a given digits array

You can just use the native toString method and then replace the output with those from the digits array:

function toBase(number, radix, digits) < if (digits && digits.length >= radix) return number.toString(radix).replace(/./g, function(d) < return digits[ parseInt(d, radix) ]; >); else return number.toString(radix); > 

A method that might be slightly faster than the way you have is to bit shift. This works most easily when radix is a power of 2, here is an example

function toBase(x, radix, A) < var r = 1, i = 0, s = ''; radix || (radix = 10); // case no radix A || (A = '0123456789abcdefghijklmnopqrstuvwxyz'.split('')); // case no alphabet if (A.length < radix) throw new RangeError('alphabet smaller than radix'); if (radix < 2) throw new RangeError('radix argument must be at least 2'); if (radix < 37) return useBergisMethod(x, radix, A); // this is arguably one of the fastest ways as it uses native `.toString` if (x === 0) return A[0]; // short circuit 0 // test if radix is a power of 2 while (radix >r) < r = r * 2; i = i + 1; >if (r === radix) < // radix = 2 ^ i; fast method r = r - 1; // Math.pow(2, i) - 1; while (x >0) < s = A[x & r] + s; x >>= i; // shift binary > return s; // done > return methodInOriginalQuestion(x, radix, A); // else not a power of 2, slower method > /* toBase(74651278, 64, '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzáé'); "4SnQE" // check reverse var i, j = 0, s = '4SnQE', a = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyzáé'; for (i = 0; i < s.length; ++i) j *= 64, j += a.indexOf(s[i]); j; // 74651278, correct */ 

Convert array of numbers to string in Javascript, How do I convert an array of numbers to a single string in Javascript? For instance, for a given array such as [4,2,2,3,3,2], how can I …

Convert number to reversed array of digits JavaScript

Let’s say, we have to write a function that takes in a number and returns an array of numbers with elements as the digits of the number but in reverse order. We will convert the number into a string, then split it to get an array of strings of digit, then we will convert the string into numbers, reverse the array and finally return it.

Following is our function that takes in a number to be reversed −

const reversifyNumber = (num) => < const numString = String(num); return numString.split("").map(el =>< return +el; >).reverse(); >;

Example

const reversifyNumber = (num) => < const numString = String(num); return numString.split("").map(el =>< return +el; >).reverse(); >; console.log(reversifyNumber(1245)); console.log(reversifyNumber(123)); console.log(reversifyNumber(5645)); console.log(reversifyNumber(645));

Output

The output in the console will be −

[ 5, 4, 2, 1 ] [ 3, 2, 1 ] [ 5, 4, 6, 5 ] [ 5, 4, 6 ]

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Convert number to reversed array of digits with JavaScript

To solve this problem, we’ll take 3 different approaches.
Enjoy the video 😀🙏

Also written version https://losseff.xyz/katas/014-convert-number-to-reversed-array-of-digits/javascript/

How do I separate an integer into separate digits in an, You can get a list of string from your number, by converting it to a string, and then splitting it with an empty string. The result will be an array of strings, each containing a digit: const num = 124124124 const strArr = `$ `.split ("") OR to build on this, map each string digit and convert them to a …

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How to Split a Number into Digits in JavaScript

There are a number of ways we can split a number into digits in JavaScript. One of the simplest ways to do this is to convert the number into a string, iterate over it, and create a new array of digits. Here is the code of how to do this, and then we will explain what is going on afterward:

var someNumber = 5436; var numberToString = someNumber.toString(); var digits = []; for( var i=0; i

In the code above, you will notice that we first convert the number to a string using the toString() method. We then make use of the charAt() method to get each individual digit, and then convert that digit back to a number using the Number() method, and finally add that number to our array. And that’s it.

Let’s put our code above into a function to make it really easy to split a number into digits.

function splitNumberToDigits(num) < var numberToString = num.toString(); var digits = []; for( var i=0; ireturn digits; >; 

And now, lets show an example of this function to see it in action:

function splitNumberToDigits(num) < var numberToString = num.toString(); var digits = []; for( var i=0; ireturn digits; >; console.log(splitNumberToDigits(100)); console.log(splitNumberToDigits(213)); #Output: [1, 0, 0] [2, 1, 3]

Let’s go over another way to do this that requires a lot less code.

Using the Map Method and Spread Operator to Split a Number into Digits in JavaScript

Another really simple way that requires less code to split a number into digits in JavaScript is to make use of the map() method, the … spread operator, and String() method.

Here is the simple code that split a number into digits using these methods.

var digitsArray = [. String(5463)].map(Number);

Where 5463 in the code above can be any number you want.

Let’s put this in a function and show this in action with a couple of examples:

function splitNumberToDigits(num)< return [. String(num)].map(Number); >; console.log(splitNumberToDigits(100)); console.log(splitNumberToDigits(213)); #Output: [1, 0, 0] [2, 1, 3]

Hopefully this article has been useful for you to learn how to split a number into digits in JavaScript.

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How to Get the Number of Digits of a Number with JavaScript?

We can get the number of digits of a non-negative integer with the Number.prototype.toString method.

For instance, we can write:

const getLength = (number) => < return number.toString().length; >console.log(getLength(12345)) 

to get the number of digits of 12345.

To do that, we create the getLength function that takes the number parameter.

And we return the length of the string form of number .

Therefore, the console log should log 5 since 12345 has 5 digits.

Get the Number of Digits of Decimal Numbers

We can’t use toString to get the number of digits of decimal numbers since it just returns the string form of the number, including all the decimal digits and other characters that comes with the number.

To get the number of digits of a decimal number, we can use math methods.

For instance, we can write:

const getLength = (number) => < return Math.max(Math.floor(Math.log10(Math.abs(number))), 0) + 1; >console.log(getLength(12345.67)) 

to get the number of digits of number by taking the log with 10 of it and then add 1 to get the number of digits of it.

We have to make sure number is converted to a positive number with Math.abs so we can take the log of it.

Next, we call Math.floor to take the floor of the log to get the number of digits excluding the leftmost digit.

Then we get the floor of the log and 0 with Math.max and add 1 to get the number of digits.

Therefore, the console log should log 5 since we use the log operation to discard the decimal digits.

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