freecodecamp--freecodecamp/curriculum/challenges/english/blocks/daily-coding-challenges-javascript/68c497f3aaefc9fd9f1b0e26.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
68c497f3aaefc9fd9f1b0e26	Challenge 62: Hex to Decimal	28	challenge-62

--description--

Given a string representing a hexadecimal number (base 16), return its decimal (base 10) value as an integer.

Hexadecimal is a number system that uses 16 digits:

• 0-9 represent values 0 through 9.
• A-F represent values 10 through 15.

Here's a partial conversion table:

Hexadecimal	Decimal
0	0
1	1
...	...
9	9
A	10
...	...
F	15
10	16
...	...
9F	159
A0	160
...	...
FF	255
100	256

• The string will only contain characters 0–9 and A–F.

--hints--

hexToDecimal("A") should return 10.

assert.equal(hexToDecimal("A"), 10);

hexToDecimal("15") should return 21.

assert.equal(hexToDecimal("15"), 21);

hexToDecimal("2E") should return 46.

assert.equal(hexToDecimal("2E"), 46);

hexToDecimal("FF") should return 255.

assert.equal(hexToDecimal("FF"), 255);

hexToDecimal("A3F") should return 2623.

assert.equal(hexToDecimal("A3F"), 2623);

--seed--

--seed-contents--

function hexToDecimal(hex) {

  return hex;
}

--solutions--

function hexToDecimal(hex) {

  return parseInt(hex, 16);
}