CODEWITHSUNDEEP
javascriptarraysnode.jshexstring-conversion
guagay_wk
guagay_wk

Reputation: 28030

Convert this hex string into array of integer in javascript

I am using node.js v6.

I have this hex string;

let hex_string = "0102030402";

I would like to convert hex_string into an array of integer array_hex_integer that looks like this;

let array_hex_integer;
array_hex_integer = [1, 2, 3, 4, 2];

The first element in array_hex_integer corresponds to '01' (1st and 2nd chars) in hex_string, 2nd element corresponds to '02' (3rd and 4th chars) in hex_string and so on.

Upvotes: 0

Views: 3666

Answers (3)

Eduard Malakhov
Eduard Malakhov

Reputation: 1114

Here is one possible way to do what you need.

var hex_string = "0102030402";
var tokens = hex_string.match(/[0-9a-z]{2}/gi);  // splits the string into segments of two including a remainder => {1,2}
var result = tokens.map(t => parseInt(t, 16));

See: https://stackblitz.com/edit/js-hozzsn?file=index.js

Upvotes: 6

iOS-Developer84
iOS-Developer84

Reputation: 654

In javascript I use this function to convert hexstring to unsigned int array

function hexToUnsignedInt(inputStr) {
  var hex  = inputStr.toString();
  var Uint8Array = new Array();
  for (var n = 0; n < hex.length; n += 2) {
    Uint8Array.push(parseInt(hex.substr(n, 2), 16));
  }
  return Uint8Array;
}

Hope this helps someone

Upvotes: 2

guagay_wk
guagay_wk

Reputation: 28030

First, split hex_string into an array of string. See my function split_str(). Then, convert this array of string into the array of integer that you want.

function split_str(str, n)
{
    var arr = new Array;
    for (var i = 0; i < str.length; i += n)
    {
        arr.push(str.substr(i, n));
    }
    return arr;
}

function convert_str_into_int_arr(array_str)
{
    let int_arr = [];
    for (let i =0; i < array_str.length; i++)
    {
        int_arr [i]=parseFloat(array_str[i]);
    }

    return int_arr;
}

let answer_str = split_str(hex_string,10);
let answer_int = convert_str_into_int_arr(answer_str);

Upvotes: 0

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