Additional snippets

snippets/RGB-to-hexadecimal.md

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+## RGB to hexadecimal
+
+Convert each value to a hexadecimal string, using `toString(16)`, then `padStart(2,'0')` to get a 2-digit hexadecimal value.
+Combine values using `join('')`.
+
+```js
+var rgbToHex = (r, g, b) =>
+  [r.toString(16).padStart(2,'0') , g.toString(16).padStart(2,'0') , b.toString(16).padStart(2,'0')].join('');
+```