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id, title, challengeType, dashedName
| id | title | challengeType | dashedName |
|---|---|---|---|
| 6821ebfd237de8297eaee799 | Challenge 23: RGB to Hex | 28 | challenge-23 |
--description--
Given a CSS rgb(r, g, b) color string, return its hexadecimal equivalent.
Here are some example outputs for a given input:
| Input | Output |
|---|---|
"rgb(255, 255, 255)" |
"#ffffff" |
"rgb(1, 2, 3)" |
"#010203" |
- Make any letters lowercase.
- Return a
#followed by six characters. Don't use any shorthand values.
--hints--
rgbToHex("rgb(255, 255, 255)") should return "#ffffff".
assert.equal(rgbToHex("rgb(255, 255, 255)"), "#ffffff");
rgbToHex("rgb(1, 11, 111)") should return "#010b6f".
assert.equal(rgbToHex("rgb(1, 11, 111)"), "#010b6f");
rgbToHex("rgb(173, 216, 230)") should return "#add8e6".
assert.equal(rgbToHex("rgb(173, 216, 230)"), "#add8e6");
rgbToHex("rgb(79, 123, 201)") should return "#4f7bc9".
assert.equal(rgbToHex("rgb(79, 123, 201)"), "#4f7bc9");
--seed--
--seed-contents--
function rgbToHex(rgb) {
return rgb;
}
--solutions--
function rgbToHex(rgb) {
const match = rgb.match(/\d+/g);
const [r, g, b] = match.map(num =>
Math.max(0, Math.min(255, parseInt(num)))
.toString(16)
.padStart(2, '0')
);
return `#${r}${g}${b}`;
}