Added a HSLToHexadecimal code snippet

snippets/HSLToHexadecimal.md

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+---
+title: HSL to Hexadecimal
+tags: math
+expertise: intermediate
+cover: blog_images/maple-leaf-palette.jpg
+firstSeen: 2020-10-01T23:15:49+03:00
+lastUpdated: 2020-10-04T11:24:27+03:00
+---
+
+Converts a HSL color tuple to Hexadecimal format.
+
+- Use the [HSL to Hexadecimal conversion formula](https://css-tricks.com/converting-color-spaces-in-javascript/) to convert to the appropriate format.
+- The range of the input parameters is H: [0, 360], S: [0, 100], L: [0, 100].
+- The range of all output values is a hexadecimal string: #000000.
+
+```js
+const HSLToHexadecimal = (h, s, l) => {
+  s /= 100;
+    l /= 100;
+    // Account for the edge case
+    if(h == 360)
+        h = 0;
+    let c = (1 - Math.abs(2 * l - 1)) * s,
+      x = c * (1 - Math.abs((h / 60) % 2 - 1)),
+      m = l - c/2,
+      r = 0,
+      g = 0, 
+      b = 0;
+
+    if (0 <= h && h < 60) {
+        r = c; g = x; b = 0;
+    } else if (60 <= h && h < 120) {
+        r = x; g = c; b = 0;
+    } else if (120 <= h && h < 180) {
+        r = 0; g = c; b = x;
+    } else if (180 <= h && h < 240) {
+        r = 0; g = x; b = c;
+    } else if (240 <= h && h < 300) {
+        r = x; g = 0; b = c;
+    } else if (300 <= h && h < 360) {
+        r = c; g = 0; b = x;
+    }
+    // Having obtained RGB, convert channels to hex
+    r = Math.round((r + m) * 255).toString(16);
+    g = Math.round((g + m) * 255).toString(16);
+    b = Math.round((b + m) * 255).toString(16);
+
+    // Prepend 0s, if necessary
+    if (r.length == 1)
+        r = "0" + r;
+    if (g.length == 1)
+        g = "0" + g;
+    if (b.length == 1)
+        b = "0" + b;
+    return "#" + r + g + b;
+};
+```
+
+```js
+HSLToHexadecimal(150, 88, 81); // #a4f9cf
+```